Post Cat O2 Sensor Voltage

All four are active in air / fuel ratio feedback. Could you confirm that your mechanic changed the POST-cat O2 sensor and not the PRE-cat O2 sensor? Would be good to rule that out before we get to the post- cat's wiring. What's normal post cat o2 sensor voltage - V6? 04-10-2017, 07:53 PM. When the rpms are increased the voltage fluctuates slightly and then settles to. Yes, the B1S1 is the afr sensor (pre-cat). A bad sensor is indicated by fluctuating over or under 1 volt for long periods of time or when it is stuck at a certain voltage( i. The catalytic converter can also suffer major damage because it relies on a specific mixture of oxygen in order to function properly. The ECU doesn't operate the heater until 35 MPH or thereabouts. It drops to 1. ( all odd number cylinders) this is the rear bank of your vehicle. Sent from my SPH. The l 1 reference voltage for the sensor is 450 mV the same as the thimble-type sensor. The higher the oxygen. An air/fuel sensor can read a much wider and leaner range of fuel mixtures than a conventional O2 sensor. " The values for them don't make any sense. To measure the efficiency of the catalytic converter, the PCM then compares the post-cat O2 sensor to the pre-cat O2 sensors. 500 Volts and 1 Volt, is considered as the Air/Fuel Mixture being Rich. Its using a voltmeter so it seems strange actually that there would be no reading at all, since that in itself is impossible, a voltmeter will say 0v if nothing is applied. Conv, Bank 1 voltage 0. Once the car starts being driven, the voltage jumps and stays steady around. In some instances, Sensor 2 can be pre-catalytic and thus making Sensor 3 post-catalytic. 8T/6sp swapped, Konis, coilover sleeves, A6Q H+R Race springs. So far its narrowed down to my 2nd o2 or first cat. I was getting O2 sensor/cat codes. Voltage is steady at steady throttle. The tip of the sensor, which is inserted into the exhaust, has a bulb that is coated with zirconium ceramic on the inside and a. The internal circuitry used in a wideband oxygen sensor produces a digital pulse width modulated signal that makes it quite different from a conventional oxygen sensor that produces an analog signal ranging from 0. So here's how to replace a front oxygen sensor for my 1999 C230 Kompressor. If the mixture is too rich (too little oxygen) or too lean (too much oxygen) than the oxygen sensor sends a signal to the ECU telling it to adjusts the. Make sure there are no engine problems first, otherwise the new converter will be damaged. Anyway, the codes are both for the downstream O2 sensor (bank 1 sensor 2). SO, this would seems to indicate that the Pre-Cat has too high a resistance, continuity, but no voltage when engine idling. If it's bad, it can't do these things correctly then all the shi* gonna end up in your Cat. Although I am concerned about possible leakage between the second O2 sensor (post cat, B1S2). This voltage tops out at 1 Volt. The O2 cheater is very cheap, $5 or less. Firstly, can I safely assume that the post-cat sensors on an E46 have no effect on performance, and are there solely for emission control? If so, assuming the heater circuits are still. They are there only to monitor the performance of the catalytic converters. o2 Sensors or Cat Right Control O2 sensor (fixed lean) and restricted exhaust test (melted cat) - GM. 15V, while the 2/2 sensor will pretty much constantly stay at ~. Stating around model year 1999, a new type of converter came on the market, called "Low Oxygen Storage Converter" or LOC. P0138 - HO2S2 (B1) (Heated oxygen sensor 2 circuit high voltage) P0139 - HO2S2 (B1) (Heated oxygen sensor 2 circuit slow response) P2096 - POST CAT FUEL TRIM SYS B1 (Post catalyst fuel trim system too lean bank 1) P2097 - POST CAT FUEL TRIM SYS B1 (Post catalyst fuel trim system too rich bank 1) ACTION. When looking at my live data, I see the front sensor is reading 0. I got CEL, VSC, 4WD lights on. 00V at idle. 8 volts, if you had cats. Please read the HG Garage Terms and Conditions first. Re: Help Please - P0136 O2 Sensor location Post by scimitargtc » Sat May 04, 2019 7:19 pm I have same car same age warranty expired same time spooky And I had po136 which I cleared but kept returning so I was lucky in that it occurred during warranty so lookers of LEEDS sorted it in under an hour had the part in stock which tells me it’s a. Hooked my laptop to it with autoenginuity and monitored the live data for the 2 sensors. > Upstream Oxygen Sensor Test: start the engine to enter KOER mode. When the O2 sensor is cold, it produces NO voltage output. The O2 sensor can be considered a small battery that has an operating range of 0 to 1 volt when fully warmed up to 600°F. We want the pre-cat sensor as the post-cat sensor is slower to respond to changes and shows a leaner mixture because of the action of the catalytic converter. with throttle steady 2000 rpm and engine fully warm the voltage should be in the range of 60-85mv steady reading with very few fluctuations. Again, depending upon the switching frequency/rate/interval. Any help would be appreciated. 005V about every 2 seconds. I back probed all the way to the ECU and just before the plug i was still only getting 1. 0L 2000-2004 at the best online prices at eBay! Free shipping for many products!. The 2nd DIY circuit would be for the Post O2 sensors, adjusting the same signal to both post O2 sensors, using the true feature of a. Don't want to throw parts at it hence why I'm looking for normal o2 voltage values. Although I am concerned about possible leakage between the second O2 sensor (post cat, B1S2). Typically, with a warmed up engine at idle that is running properly, both the pre-cat and post-cat sensor signals would be steady, with the post cat sensors indicating something in the range of 0. Obviously, replacing the sensor was not the proper fix. 7 air to fuel mixture. The vehicle had come from another shop, which had already replaced the oxygen sensor. Voltage is steady at steady throttle. They are there only to monitor the performance of the catalytic converters. 20 degree C) If the specification was not obtained: Replace the Heated Oxygen Sensor (HO2S) G39. This put the actual naked O2 sensor just 2-3 mm from the mini catalyst and about 1 cm from the main exhaust flow, and that is what finally did the trick! This particular min cat is sold all over the place and runs about $35 : [IMG] Mini cat for O2 sensor bung, straight_ Racing Dynamics by Eric Michel, on Flickr[/IMG]. I have a 2003 Subaru Outback wagon (2. This usually tricks the o2 sensor into believing the cat is working correctly. The female wire harness on the new o2 sensors would not plug directly into the male harness like the factory sensors could. Two wires are dedicated to the heating element and two wires are dedicated to the sensor. Again, spot on. My car failed a smog test, and I have to replace the pre-cat O2 sensors. Normally you want the downstream oxygen sensor voltage to be somewhere in the 2. What does P2243 mean? This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). SPN 627 FMI 17, system voltage data valid but below normal range. If it's bad, it can't do these things correctly then all the shi* gonna end up in your Cat. By rapidly changing the air/fuel mixture back and forth, the overall mixture averages out and keeps emissions at a minimum. SO, this would seems to indicate that the Pre-Cat has too high a resistance, continuity, but no voltage when engine idling. Thanks for the info. On some newer vehicles, a new type of "wideband" oxygen sensor (also called an "air/fuel. That might be the failure, of course, but the code ONLY means it sees a problem in the heater circuit. The 2 upstream sensors (bank1+bank2) follow each other almost identically, varying ~. O2 Catalyst Monitor Testing Pre Cat and Post Cat There are (is) an additional O2 sensor after the catalyst converter that can monitor the performance of the catalytic converter. P2270 BMW Description The Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Maintain your BMW with durable parts that just won't quit like the BMW E60 5-Series O2 Sensor Post Cat OEM 11787514926 or 11787514927. If they are doing the same thing, it means the cat is inoperative. This is often normal during a sudden fuel event that the catalytic converter, even when good, cannot instantly clean up. 800V That sounds spot on. Related Questions Where is the oxygen sensor on the catalytic. The ECU basically ignores it until you get into the catalyst monitor test range MPH. The new sensor will soon fail unless the coolant leak is fixed. (Catalytic converter below efficiency threshold). This put the actual naked O2 sensor just 2-3 mm from the mini catalyst and about 1 cm from the main exhaust flow, and that is what finally did the trick! This particular min cat is sold all over the place and runs about $35 : [IMG] Mini cat for O2 sensor bung, straight_ Racing Dynamics by Eric Michel, on Flickr[/IMG]. If it's bad, it can't do these things correctly then all the shi* gonna end up in your Cat. I figured it was the gas cap, because I usually fill the tank for her, but she did this time. the owner of a 1998 E320 pulled codes P0156 and P0161. As the catalyst becomes less efficient, the catalyst efficiency ratio increases and the post-cat waveform begins to look more and more like the pre-cat waveform. Now it is on again. Cat converter. 9 volts) for more than 10 seconds indicating a lack of oxygen in the exhaust stream and an abundance of fuel at sensor 2 on the bank 1 of the. 2 sensors - pre cat is an AF ratio sensor post cat is a o2 sensor What is the code - as far as using auto equity to graph them dan can help, BUT what code would help. Page 2 of 2 - Expected Voltage Post Cat O2 Sensor? - posted in VX220 Discussion: Thanks both, Ill check the resistance/continuity across the white wires at the weekend. 35-40 secs from start up. The 10% rich at idle is probably ok because map cars are more forgiving than maf cars. Changed out both pre-cat sensors and now no codes. This "efficiency" is typically measured by the difference in the upstream and downstream O2 sensor readouts. As I understand it, this sensor does not affect fuel trim but only monitors exhaust. OEM O2 sensor to keep your emissions system running smoothly. A trouble code that points to an oxygen sensor (such as p0420, p0135, p0141, or others) is only the first step in your mechanic’s diagnosis of the problem. The only way that a converter efficiency code could be caused by a bad rear O2 sensor is if the sensor's voltage fluctuation somehow sped up relative to the front sensor. You might be right about the traditional way of removing the sensor and use volt meter and flame to test might not work but idk. If your scan tool has a graphing ability turn it. For reference P0138 refers to the POST-CAT sensor. after i changed my o2 sensors it started bringing up a p0420 code. The centech obd will read voltage from both. ByteLogger v1. An America user has come across a cat sensor blank from a Camaro, that can replace the O2 sensor and fools the ECM. I bought an o2 sensor simulator from o2sim. What series of clicks and taps do I need to get this test up and running? (in terms of measuring blocks and being able to produce a report that I can post here) 2000 VW beetle 2. vitodeluca, check these fuses first: No. Once you have done this, you will need to connect it to the pins for the. Hi, I am interested in checking the performance of my O2 sensors both before and after the cat. * If a O2 sensor, wideband O2 sensor or A/F sensor has failed because of coolant contamination, do not replace the sensor until the leaky head gasket or cylinder head has been replaced. At the point of most efficient combustion, the voltage takes a large step down, which signals to the ECU that this so-called 'stoichiometric point' has been passed through. Sometimes the post-cat oxygen sensor will have a gap of time between the pre-cat sensor switching voltage and itself. Changed out both pre-cat sensors and now no codes. Also, Oxygen Sensors need to reach a minimum operating temperature of 750 - 2003-2007 Honda Accord. Oxygen sensor performance can be checked by reading the sensor's output voltage to make sure it corresponds with the air/fuel mixture (low when lean, high when rich). Design The O2 sensor used upstream of TWC (G3/2) is designed as a wideband oxygen sensor. (254 vote (s)). Changed it out. IF the downstream heated O2 sensor falls below. Direct replacement for BMW part #11787576673. This is often normal during a sudden fuel event that the catalytic converter, even when good, cannot instantly clean up. The O2 sensors become slow to respond overtime and therefore activate the CEL as the heating element inside them no longer function (or a slow to heat up) - if this was true, the CEL will activate after approx. I am waiting till it warms up (Alberta Canada) and see if i still get the CEL. On early OBD II systems, the post-cat O2 sensor should show little or no voltage fluctuations on a scope waveform, since all the mixture fluctuations are being absorbed by the catalytic converter. Bank 1 Sensor 1 (Upstream) (pre-cat) P0130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1) P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1) P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) P0134 O2 Sensor Circuit No. All four are active in air / fuel ratio feedback. Learning how to check an oxygen sensor (O2) will help you confirm a potential problem with the sensor in your vehicle before you spend time and money replacing a unit that might not even need a replacement in the first place. With the rear O2 sensor completely removed, you can modify it on your work table or where ever you want, instead of cutting and splicing while underneath your rig. Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums. 18 posts - 9 authors - Last post: Mar 27, 2008I tested my o2 sensor's voltage. Well, there it is, one of the best-kept secrets in the smog-loving world. Disconnect the connector and remove your post-cat O2 sensor. Hi, I am interested in checking the performance of my O2 sensors both before and after the cat. This article describes how to test an O2 Sensor while it is still on the vehicle. But then I see something funny. The front O2 will see that cycling we talked about above around. Not a O2 sensor for pre cat. O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. Two wires are dedicated to the heating element and two wires are dedicated to the sensor. It then feeds this information to an on-board computer known as the Engine Control Unit (ECU). A typical Zirconia lambda sensor has four wires. Pre cat sensor switches between 0. You might be right about the traditional way of removing the sensor and use volt meter and flame to test might not work but idk. That might be the failure, of course, but the code ONLY means it sees a problem in the heater circuit. Passenger side Post CAT. Bank 2 Sensor 1 is top right side pre cat and Bank 2 sensor 2 is right post cat or bottom. The second O2 sensor, post cat, is there just to verify that the cat works. I am getting the codes above, and need to know which one is Bank 1, Sensor 2 specifically. Post cat O2 behind the cat should read be fairly constant, if the catalytic converter working properly. Also referred to as an ISO – HEGO Sensor (Isolated Heated Exhaust Gas Oxygen Sensor). The other is post cat or sensor number 2. 50 = Fail) I'm not sure if I should just bite the bullet and replace the Pre-Cat O2 Sensor or the Cat. This voltage tops out at 1 Volt. I have read that in some cars which use a wideband O2 sensor. Make sure there are no engine problems first, otherwise the new converter will be damaged. Since I know why, I really don't need to know how this translates to voltage, etc. The vehicle had come from another shop, which had already replaced the oxygen sensor. E46 325/330: -2/2003. The second post-cat sensor is intercepted by the O4I and O4O wire pair. J Your post oxygen cat sensor on one of your banks is fluctuating all over the place while the other is steady, if I remember correctly they should both be fairly steady if the cat is functioning properly. The Post-Cat O2 is there to ensure it is up to that temperature so it can do its job as well as monitoring how well it's working. The 2nd DIY circuit would be for the Post O2 sensors, adjusting the same signal to both post O2 sensors, using the true feature of a. Its his secondary sensor that does not, i repeat that does not determine air fuel mixture or what it does. Using a digi high impedance voltmeter you connect the red lead to o2 sensor signal wire. voltage supply was minimal around 1. 0L 8946529525. As for the rear (downstream) sensor, it only needs to be changed if it throws a code or the Check Engine Light turns on. Left and right sensor positions are found in reference to the rear of the engine (the side opposite of the belts). For reference P0138 refers to the POST-CAT sensor. 2L, my check engine light came on and the code my OBDII reader gave was 'P0132' "O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)" Update : My O2 sensor in my cat was changed recently. If it's bad, it can't do these things correctly then all the shi* gonna end up in your Cat. The secondary sensor is not a wideband only reads voltage 0-1v while the primary reads 0-5v. On OBDII vehicles there are two sensors, one in front of the converter called the pre-cat sensor and one behind the converter called the post-cat sensor. P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2 P0141 HO2S Heater Circuit Bank 1 Sensor 2 Would this be a bad cat or Rear O2 Sensor. If the converter efficiency is poor (because of contamination), the downstream O2 sensor output will seem like the upstream O2 sensor output; that is the post cat oxygen sensor will change extra ceaselessly between lean and rich voltage levels just like the pre cat oxygen sensor. If the cat is doing it's job the pre cat sensor wil jump and the post cat shouldn't move much. Scanned and it came up as P0136 Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2). It will read an accurate mixture, usually, but not necessarily, a voltage of 0. 0L manual trans California/Exhaust. The voltage does not change even with considerable adjustment. 02:1 and the lambda is 0. 9 V (low oxygen, rich mixture). With engine running in closed loop the voltage should read over 800mV and lower then 200mV and constantly fluctuate. An air/fuel sensor can read a much wider and leaner range of fuel mixtures than a conventional O2 sensor. My daughter has an 05 mini cooper. I am waiting till it warms up (Alberta Canada) and see if i still get the CEL. I assumed the sensor was bad. Dealer wants over $300 to replace and says if the sensor is not replaced, damage will occur to catalytic converters. It only gives you a clue. P0138 O2 Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2) P0037 O2 Oxygen Sensor Heater Control Circuit Low (Bank 1, Sensor 2) I guess I needed to be a little more specific. Stating around model year 1999, a new type of converter came on the market, called "Low Oxygen Storage Converter" or LOC. At idle, my 1/2 sensor will read ~. 1 volts) that determines the level of fuel content in the exhaust. Show Full Signature 2001 Passat 4Mo wagon, 1. if the 2 readings are the same, then the comp. 15V, while the 2/2 sensor will pretty much constantly stay at ~. 3l-l4 post-cat oxygen sensor please check fitment notes description for accurate information. Second Generation Nissan Xterra Forums. Voltage is steady at steady throttle. AFR looks okay. both sensor 2's (bank1 and 2) were reading lower voltages around. Can this be true?!. When I accelerate (shifting gears) the after cat o2 sensor is a almost a mirror of the pre cat o2. 05) but this reduces to 0. Using ELM327 Mini OBDII reader and Torque Pro App Diagnose o2 sensor voltage readings. If your scan tool has a graphing ability turn it. The computer compares the readings from the (O2) sensor (pre cats) and the monitors (post cat) to determine if the catalytic converters are doing their job and “cleaning” the exhaust. And the invoice with the new post-cat one I have on my desk lists it as a "new premium high performance O2 oxygen sensor Lexus Toyota. Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums. I just need to know how to prevent the O2 sensor from detecting the high level of O2 in the exhaust flow. An O2 sensor "makes" voltage. Show Full Signature 2001 Passat 4Mo wagon, 1. In this process, the oxygen sensor reacts with the un-burned oxygen and generates a low-voltage signal (usually 0 – 1. A P0144 Nissan definition:a fault at the post-cat o2 sensor, indicating that the signal voltage is too high. So would a dead O2 sensor cause a phantom code but not a real one? Weird. No, the post cat sensor will remain a nearly flat line when the engine is a steady speed, if the catalyst is good. Blue = front 'pre' sensor, Red = rear 'post' sensor. A trouble code that points to an oxygen sensor (such as p0420, p0135, p0141, or others) is only the first step in your mechanic’s diagnosis of the problem. 1 volts and 0. OEM O2 sensor to keep your emissions system running smoothly. This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. The way I check this is by swapping the post cat sensors from bank to bank. The post-cat O2 sensors are identical to the pre-cat O2 sensors (same voltage outputs). 271D - Oxygen Sensor Pre Cat Bank 1: Activation 2715 - Oxygen Sensor Heater Pre Cat Bank 2 : Activation 2717 - Oxygen Sensor Heater Post Cat Bank 2 : Activation 2716 - Oxygen Sensor Heater Post Cat Bank 1 : Activation I can't believe all four sensors failed at precisely the same time after I installed the camshaft postion sensor. The 2nd DIY circuit would be for the Post O2 sensors, adjusting the same signal to both post O2 sensors, using the true feature of a. I don't want to get a CEL for a missing/inoperative cat so I'm thinking about doing something a lot of the 1. it only has 3 o2 sensors. 74v mainly). Hey guys does any one know how a sv6 sidi will react to not having the rear post cat o2 sensors connected changed my exhaust and need new sensors but have to wait a couple of days for them to get to me, I'm guessing it will just run rich or lean. The only difference between any of them is the plug. The catalyst acts as a homogenizer of fuel mixture so the rich to lean cycling seen pre-cat gets averaged out. I have a 98 Cavalier 2. P0137 - OBD-II Trouble: O2 Sensor Circuit Low Voltage What Does P0137 Code Mean? Code P0137 is triggered when the powertrain computer or PCM determines that the rear oxygen sensor voltage remained below 400 millivolts for more than twenty seconds (varies with vehicle make and model) or that the air fuel ratio sensor remained in a lean-biased. i turned off all the post cat 02 sensors that i could find but it keeps throwing a check engine light about 3-4 days. Use the 7/8" wrench to unscrew the sensor. 5 A) fuse in the under-dash fuse/relay box. The dealership carrys 2 A/F sensors for the 2005 X depending on build date. At WOT, even tho your O2 sensors do nothing to control fueling, your after cat sensors should rise from low 0. On V6 and V8 applications with dual cat exhausts, you'll have upstream O2 sensor readings for each side of the engine and downstream O2 sensor readings for each converter. 0L sport, and recently got the (OBDII) P0132 & P0138 codes which are High Voltage Output in sensors 1 & 2. The O2 sensor used in most vehicles is a voltage generating sensor. However, by taking the oxygen sensor off, you are able to visually inspect the sensor, which can often provide a good indication that there is a problem, and testing the sensor is also a little easier. The cat smooths out those fluctuations in the O2 content of the exhaust gas mixture. Now observe the scan tool bank 2,2 o2 sensor reading. IF the downstream heated O2 sensor falls below. I went to AutoZone and got an oil drain plug (part# 050-090. 50 = Fail) I'm not sure if I should just bite the bullet and replace the Pre-Cat O2 Sensor or the Cat. converter and O2 sensors (2001 Toyota Tacoma) Try after market part,but the last 2yrs the engine light comes on 6-8 weeks apart. Also make sure you match it up against your engine code. I assumed the sensor was bad. His mechanic changed the right hand side (passenger) post cat O2 sensor. If the post-cat sensor is switching rich-lean like a pre-cat sensor then the catalytic convertor is not working at all, or it is not there anymore. I had engine code P305. Additionally, CODE PO158 is for the O2 sensor AFTER your cat. However, a properly working post-catalyst sensor will exhibit small changes at a slower rate than front (pre-catalyst) o2 sensors. 5 volts (it fluctuates) and has gone up to almost 2 volts (way too high). 95 volts instead of an expected 0. Usually post-cat sensors aren't used for engine tuning, only as a 'confirmation' the cat is working. CaveVan Forum; rpm, o2 voltage, throttle position and I assume the knock sensor reads it as a misfire. "Bank 2 Sensor 1 is on the driver side - follow the right side of the engine down the headers which attaches to the catalytic converter. The 2 upstream sensors (bank1+bank2) follow each other almost identically, varying ~. Below are the recorded graphs while I was driving with new O2 sensor. Looking for troubleshooting help, not cat replacement help. Bank1 Sensor 2 Resistance is at 800ohms I'm wondering if this should be lower, Bank1 Sensor 1 is at 300ohms. 197K kms (122k miles) and started getting lean code and heater code on bank 2. This article describes how to test an O2 Sensor while it is still on the vehicle. Not cleaning the wires and electrical terminals of the O2 sensor. The computer compares the readings from the (O2) sensor (pre cats) and the monitors (post cat) to determine if the catalytic converters are doing their job and “cleaning” the exhaust. A properly operating catalyst consumes most of the O2 (oxygen) that is present in the exhaust gas. P2270 BMW Description The Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. 63 Oxygen Sensor, Heated - Sensor 2 (Secondary) high voltage, low voltage, or slow response 65 Oxygen Sensor Heater (Secondary) malfunctioning or defective oxygen sensor heater If the sensor was detecting a cat problem, you'd get this. rear o2 voltage is usually steady at or about the 500mv range, thats how the dme knows your cat are working properly. If the downstream O2 sensor activity mirrors the upstream O2 sensor, the converter is dead and needs to be replaced. There are 2 lambda sensors on your car, 1 is a pre cat or sensor number 1. It means the computer is comparing the pre cat O2 sensor value with the post cat O2 sensor value. I bought an o2 sensor simulator from o2sim. If the heater is non-operational, but the sensor still outputs some voltage, you'll throw P0136 (B1S2 heater malfunction). I still have the same problem. 35-40 secs from start up. Where there's a Sensor 3, it's signal might be helpful in some cases. The tip of the sensor, which is inserted into the exhaust, has a bulb that is coated with zirconium ceramic on the inside and a. It can and likely will lean or rich as the PCM chooses its fuel control strategy. What series of clicks and taps do I need to get this test up and running? (in terms of measuring blocks and being able to produce a report that I can post here) 2000 VW beetle 2. 15V, while the 2/2 sensor will pretty much constantly stay at ~. To verify the o2 sensor works, I switched the two downstream sensors. However, it is possible for a bad cat. The customer concern is a sudden decrease of 20% in fuel economy. That being said, according to the Nissan Shop Manual the correct voltage for the AIR/FUEL RATIO SENSOR should be 1. I have a new OE O2 sensor that I can swap but it appears this is a CIRCUIT issue, not a cat below efficiency or a O2 sensor failure, per se. That's what you want. The CEL will come on if the secondary O2 sensor itself fails. Toyota set this up to meet CA emissions, so the required efficiency of the cats is much higher than what is required in the other 49 states. Best is cruise @ 2000 RPM. P0130 02 Sensor Circuit Malfunction (Bank I Sensor 1) P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I) P0132 02 Sensor Circuit High Voltage (Bank I Sensor 1) P0133 02 Sensor Circuit Slow Response (Bank 1 Sensor 1). In some instances, Sensor 2 can be pre-catalytic and thus making Sensor 3 post-catalytic. Since I know why, I really don't need to know how this translates to voltage, etc. Pre cat sensor, Cat, post cat sensor, toyota iridium spark plugs changed, no exhaust leaks, no vacuum leaks. 90 volts indicating proper a/f ratio. The second O2 sensor, post cat, is there just to verify that the cat works. 2004 Toyota Highlander, 2. Thats why California banned those a few years ago. I had also just changed the air filter, so thought it might. O2 Sensor Delayed Response - Rich to Lean (Bank 2 Sensor 2) Condition for fault identification Test condition: * Determine whether oxygen sensor voltage remains above 649 mV (K_LANK_OBD_S_SA_US). 2 seconds - OK More than 1. It moved a little but overall it was stable here (0. the code is referring to a heater circuit malfunction on the after cat sensor the heating circuit is fused, but this is unlikely to be a fuse issue as it shares the same fuse as the pre cat sensor, though it may be a wiring problem somewhere between the fuse and the sensor as the sensors run seperate wires from the fusebox. Re: Help Please - P0136 O2 Sensor location Post by scimitargtc » Sat May 04, 2019 7:19 pm I have same car same age warranty expired same time spooky And I had po136 which I cleared but kept returning so I was lucky in that it occurred during warranty so lookers of LEEDS sorted it in under an hour had the part in stock which tells me it’s a. Wrong O2 Sensor- If you are getting P0138 after having recently replaced your Oxygen sensor, it may be that the replacement is wrong or bad. If the Oxygen (O2) Sensor only produces a low or high voltage signal, either you have an engine performance issue or the Oxygen (O2) Sensor stopped working. It drops to 1. 2005 toyota hiace P0420. If the sensor is sluggish or reads low, it needs to be replaced. The pre-converter O2 sensor should oscillate between high and low (rich and lean), while the post-converter should read a 'flat' near perfect stoichiometric a/f ratio. Oxygen Sensor Spacers & Isolators. After several minutes of idling, the 1/2 sensor is still the same, and the 2/2 sensor will finally drop down to about. A switching voltage on the post-cat sensor indicates that the gases are passing across the catalytic converter's ceramic monolith without being subjected to chemical change and therefore the cat requires replacing with a known good unit, providing that the pre-cat waveform is within specification. The shop that called me also replaced the O 2 sensor. Left and right sensor positions are found in reference to the rear of the engine (the side opposite of the belts). If you have an infrared thermometer handy, you could measure the temp of the cat with the car running at at least 1500 rpma functioning cat. You will have NO CEL at this time. Can I just buy 2 o2 sensors? Some companies say "pre o2" while others say "replacement o2 sensor" ((Because I know some one will ask even though it has little to do with the Q *suzuki aerio sx 2003)). Q-4: Is it alright to drive with a bad oxygen sensor? This is not recommended because you should get it fixed as soon as possible. 055 Short Term Fuel Trim Bank 2-Sensor 2(%)99. In late models Chryco does use the post cat O2 to fine tune the mixture, but in a 97 cherokee, it's only function is catalyst monitoring. engine) For the pre-cat I get the following results; Via VCDS: display zone 1: 80 Ohms (spec: 6. Check the harness plugs on the O2 sensors for moisture or corrosion. For Nissan to go back to an O2 sensor for pre cat would be like going back to vacuum tubes. Pre-Cat Oxygen Sensor, Bosch - 550i/650i/750i, X5/X6 50i, X5M/X6M. Sometimes the post-cat oxygen sensor will have a gap of time between the pre-cat sensor switching voltage and itself. Not sure if I have faulty o2 sensors, a bad cat or an exhaust air leak. The repair manual gives the expected output for each sensor: A/F sensor (upstream oxygen sensor) +25 % –> Rich output: less than 3. Post by bubba » Fri Jun 03, 2016 5:21 pm. Bank 2 Sensor 1 is top right side pre cat and Bank 2 sensor 2 is right post cat or bottom. All the others are bouncing up and down mostly between 0. On vehicles where there are multiple converters you will find multiple sensors. I would delete the rear o2 sensors with tunercat if I knew the sensors was the problem. 5 volts when the engine is running normally. The Library has a Post by me about the ECU wiring Differences for Spyder and Celica. Where there's a Sensor 3, it's signal might be helpful in some cases. Any deficiency in any sensor will set a DTC. Sensor 1x2 (post-cat) should offer a stable reading if the cat has done it's job. The ECM then compares the readings of the two O2 sensors to determine if the converter is functioning within set parameters. In fact, those who remove their CAT (not legal for the street) replace their post sensors with a post o2 simulator which puts out a constant voltage to keep the ECU happy - no codes or CEL. Upstream and downstream. I had a look at the wires and there was no obvious damage despite the nearside boot drain dumping water onto that cable. Sent from my SPH. 5V) for reference voltage to the sensor through one wire, and sensor ground to the other wire. The passenger side post-cat oxygen sensor appears to be impossible for me to remove. The performance of the O2 sensor tends to diminish with age as contaminants accumulate on the sensor tip and gradually reduce its ability to produce voltage. With engine running in closed loop the voltage should read over 800mV and lower then 200mV and constantly fluctuate. But that's only in shorter logs where the sensor voltages are indicated. 94 "Cat B1 not OK" (<0. The post-cat O2 sensors are identical to the pre-cat O2 sensors (same voltage outputs). Fuel trims are 4. Hey guys, need help diagnosing an issue on my 2013 392 6. Learning how to check an oxygen sensor (O2) will help you confirm a potential problem with the sensor in your vehicle before you spend time and money replacing a unit that might not even need a replacement in the first place. The upstream ones are a little more tricky, as there is. Here is a fantastic video that covers all aspects of diagnosing the P0137 code:. In your case bank1 sensor 1 is the one on the odd side and bank 2 sensor 1 is on the even side. 400 your cat is good. Here is a block of oxygen sensor codes from P0130 through P0167: P0130 Heated Oxygen Sensor (HO2S) Circuit Closed Loop (CL) Performance Bank 1 Sensor 1. M18 O2 Sensor Spacer Mechanical Simulator 304 Stainless Steel 45mm Long - Pack of 10 Retail: $129. The 2 upstream sensors (bank1+bank2) follow each other almost identically, varying ~. The most important sensors are usually the Sensor 1 and Sensor 2. says bad cat. 10 Volts - Lean mixture). I replaced post cat O2 sensor to new Denso O2 sensor. Also, you cannot judge these readings at idle. In the graph at right, the downstream oxygen sensor voltage stabilizes at about. The shop that called me also replaced the O 2 sensor. Snap throttle test (Figures 5 & 6). Front Bank LH Post Cat Oxygen Sensor Oxygen O2 Sensor Bosch - 0258006760 Click here to play audio ZPN-30983 Front Bank LH Post Cat Oxygen Sensor Oxygen O2 Sensor Bosch - 0258006760. After several more minutes of idling, both O2 sensors will generally read the same. To verify the wiring, I plugged the B1S2 harness into the B2S2 o2 sensor and it worked plugged into the other side of the car. Thus only the Honda wideband sensor can be used with the wideband controller in the Honda ECU. "Bank 2 Sensor 1 is on the driver side - follow the right side of the engine down the headers which attaches to the catalytic converter. It means the computer is comparing the pre cat O2 sensor value with the post cat O2 sensor value. take readings then. To start viewing messages, select the forum that you want to visit from the selection below. sensor 1 output voltage and fuel trim both changed rapidly. This information is sent from the O2 sensor to the vehicle's on-board diagnostic computer. A heated o2 sensor is capable of switching between 0. After changing both my post cat o2 sensors tonight and driving it with the engine scanner plugged in I mainly read 0. I admit I am quite uneducated about the values of these sensors and I learn a bit at a time as I follow these threads. Or, idle 2500 RPM. Maintain your BMW with durable parts that just won't quit like the BMW E60 5-Series O2 Sensor Post Cat OEM 11787514926 or 11787514927. Functioning like a monitor, your oxygen sensor works like this: the O2 sensor tip is located inside of your exhaust pipe, the oxygen sensor detects the percentage of oxygen in the exhaust. 2 Seconds - Replace oxygen sensor 03 Boxster S DME maps have an anomaly that causes the check light to come on too early durng adaption. Check engine was on, now is off and all monitor are ready including catalytic converter. The car is a 2002 impala 3. That's what you want. Normally you want the downstream oxygen sensor voltage to be somewhere in the 2. It can be a faulty sensor / short but sometimes this fault can be triggered by just a low voltage situation on startup. Can I just buy 2 o2 sensors? Some companies say "pre o2" while others say "replacement o2 sensor" ((Because I know some one will ask even though it has little to do with the Q *suzuki aerio sx 2003)). A bad or failing oxygen sensor will have a negative impact on environmental emissions and engine performance, so there are a few things to watch out for before your oxygen sensor completely fails. If the post-cat sensor switches 90 times for every 100 for the pre-cat sensor, that’s an efficiency ratio of. and the post-cat sensor will be a 4 wire Zirconia type. 5L afr sensors there are 2 upstream afrs, what is the normal voltage range of them? than the 2 downstream o2 sensors are they used to fine tune the fuel control,or just to see the health of the cat?. The Zirconium dioxide oxygen sensor¡¯s core incorporates a hollow thimble-shaped Zirconium dioxide ceramic element, which is coated with a thin micro porous layer of platinum on both inner and outer surfaces. Post-cat O2 sensors. My daughter has an 05 mini cooper. The HO2 sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level. Details about OE Plug Post-Cat Oxygen O2 Sensor 2 for Lexus SC300 02-07 L6-3. The oxygen sensor voltage increases as a result of this richening, and the computer reacts by reducing fuel flow. If the post-cat sensor is switching rich-lean like a pre-cat sensor then the catalytic convertor is not working at all, or it is not there anymore. I had stumbled on a post that had a walkthrough on how to disable them and did so with success. i selected that it not throw a. I also notice high hydrocarbons at 415 PPM. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i. Find Oxygen Sensors with 0-1 V Voltage Range and Rear post-cat Oxygen Sensor Location and get Free Shipping on Orders Over $99 at Summit Racing!. (Needed to warm up cat and O2 sensors fully) Note: The post-converter O2 sensor should read a "gliding" voltage if the cat is functional. It is easy just to get under the car to replace them. Tells the computer if the car is running rich or lean, so the computer can control the fuel injection (or CCC carburetor) to a stochiometric ratio (14. 8T/6sp swapped, Konis, coilover sleeves, A6Q H+R Race springs. Oxygen sensor heater for oxygen sensor must be OK, check => page VW-A4-FU14-23-002-1023-103. Again, spot on. (This car has 2 o2 sensors – B1S1 and B1S2) B1S2 is putting out almost no voltage (. The performance of the O2 sensors can be measured using a scan tool, a DVOM or a ­labscope. The PCM flagged the low sensor output with the P0137, but I'm having a hard time accepting the fact that this was caused by a hollowed-out cat, especially when you look at the exhaust gas readings. if you have a scanner with some live data, get that going and look at the voltage of the b1s2 o2 sensor, if it hovers around 0. I use am OBD-II scanner to read my O2 sensors. 5L afr sensors there are 2 upstream afrs, what is the normal voltage range of them? than the 2 downstream o2 sensors are they used to fine tune the fuel control,or just to see the health of the cat?. If you have access to a scanner use that! Otherwise, use a multi-meter and make sure that the voltage is FLUCTUATING between. 999 volts) that the computer uses to calculate AFR. Scanned and it came up as P0136 Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2). Oxygen Sensor. 9 volts after starting the engine for 2 or 3 minutes. 02:1 and the lambda is 0. The customer concern is a sudden decrease of 20% in fuel economy. If your scan tool has a graphing ability turn it. Show Full Signature 2001 Passat 4Mo wagon, 1. The O2 sensors become slow to respond overtime and therefore activate the CEL as the heating element inside them no longer function (or a slow to heat up) - if this was true, the CEL will activate after approx. Hooked my laptop to it with autoenginuity and monitored the live data for the 2 sensors. To verify the o2 sensor works, I switched the two downstream sensors. The O2 simulator is a plug-in replacement for the secondary O2 sensor that will provide the PCM with a signal that emulates a healthy cat for testing and off-road purposes. hi all, this is in regards to a 2014 silverado with the 5. Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums. This feedback is taken for correcting the air fuel ratio by controlling the fuel volume and thus opt. As fuel quantity decreases we return to a lean mixture, and sensor voltage drops. 2 Seconds - Replace oxygen sensor 03 Boxster S DME maps have an anomaly that causes the check light to come on too early durng adaption. A O2 running normally will change voltage about 7-8 times in 10 seconds at idle. My '01 cvt has only 2 sensors, 1 pre-cat and 1 post cat. M18 O2 Sensor Spacer Mechanical Simulator 304 Stainless Steel 45mm Long - Pack of 10 Retail: $129. The voltage signal can also be displayed as a wave form on an oscilloscope to make sure the signal is changing back and forth from rich to lean and is responding quickly enough to. So the rear 02s should be around. Blue = front ‘pre’ sensor, Red = rear ‘post’ sensor. Joined Aug 7, 2013 · 73 Posts. Note: if you get another code for an O2 sensor frozen, its because the resistance and capacitance values were not optimized to match the curve. So, after 331K, the post-cat O2 sensors are finally throwing faults (surprisingly, in unison) in my 325Ci. An O2 sensor "makes" voltage. it has 3 catalytic converters. My 99 Silverado with the 6. In my MODded '03, I know I can overwhelm the CAT, which allows more O2 to be sensed by the rear O2 sensor, thus causing a CEL code P0420. The freeze frame data shows that the B1S2 oxygen sensor reads 0 volts. The most important sensors are usually the Sensor 1 and Sensor 2. 015) at idle when the car is started, warmed up, and has entered a closed loop. On some vehicles the rear sensor does have some effect on fuel control. O2 Catalyst Monitor Testing Pre Cat and Post Cat There are (is) an additional O2 sensor after the catalyst converter that can monitor the performance of the catalytic converter. The o2 sensor heater allows the o2 sensor to warm up faster, thus achieving closed loop in less time than it would normally take for the exhaust to warm the sensor up to operating temperature. 2 Seconds - Replace oxygen sensor 03 Boxster S DME maps have an anomaly that causes the check light to come on too early durng adaption. When I accelerate (shifting gears) the after cat o2 sensor is a almost a mirror of the pre cat o2. Since the next sensor is after the Y it is considered bank 1 sensor 2 and that would make the last or post cat sensor bank 1 sensor 3. Is there a real difference between o2 sensors pre and post cat or is it just reffering to the location? What I'm asking is, since both my o2 sensors need to be replaced. Wrong O2 Sensor- If you are getting P0137 after having recently replaced your Oxygen sensor, it may be that the replacement is wrong or bad. All O2 sensors are vented to the atmosphere which contains Approximately 21% oxygen. J Your post oxygen cat sensor on one of your banks is fluctuating all over the place while the other is steady, if I remember correctly they should both be fairly steady if the cat is functioning properly. Please read the HG Garage Terms and Conditions first. 8T VW guys have been doing for years. 3 posts - 2 authors - Last post: Oct 6, 2002[Archive] bad o2 reading and bad idle, related ? Help! Tech. O2 Heating Period Bank 1/2: This shows the oxygen heater period for cylinder bank 1/2. Also, Oxygen Sensors need to reach a minimum operating temperature of 750 - 2003-2007 Honda Accord. Post Cat O2 sensors. both sensor 2's (bank1 and 2) were reading lower voltages around. 2 fault codes are logged, O2 sensor circuit, Bank 1 sensor 1 (P0130) and O2 sensor heater circuit, Bank 1 Sensor 2 (P0141) According to the data stream, O2 sensor 1 sits at around 0. If the post-cat sensor switches 90 times for every 100 for the pre-cat sensor, that’s an efficiency ratio of. I use am OBD-II scanner to read my O2 sensors. Again, depending upon the switching frequency/rate/interval. elaborate more. The O2 cheater is very cheap, $5 or less. Now it is on again. 3 most of the time. The first sensor in the stream ahead of the converter is use to trim the fuel calibration to keep the emissions to a minimum, the post-cat sensor is to monitor the efficiency of the converter. Try swapping them with the post cat sensors and see if you get the codes again. In this manner, the computer adjusts for minor errors and variations from the rest of the input sensors and controls the air fuel ratio at 14. To measure the efficiency of the catalytic converter, the PCM then compares the post-cat O2 sensor to the pre-cat O2 sensors. At WOT, even tho your O2 sensors do nothing to control fueling, your after cat sensors should rise from low 0. Once they start creating voltage the ecm looks at the voltage and the engine should go into closed loop. 45 at fast idle or on road at speed. Step three: Cut the harness off of the O2 sensor as close as possible to have as much wire to work with as you want. o2 Sensors or Cat Right Control O2 sensor (fixed lean) and restricted exhaust test (melted cat) - GM. A real cat is closer to $500-$1000. The only difference between any of them is the plug. passed smog earlier this yearMy wife was driving when the check engine light came on. Voltage codes can be caused by sensors that are bad and stuck lean or rich. 2005 toyota hiace P0420. Still O2 sensor output voltage stuck to 0. Now some spares dealers do wide bandwidth or what we call shitty universal, ok to get you out of a tight spot, but don't be surprised if it causes problems. This refers to a trouble in the Bank 2 Sensor 2 of the O2 (oxygen) sensor, which is located near the backside of the exhaust, behind the catalytic converter. I switched the coils between 5 and 7. If the oxygen sensors are functioning normally, voltage on pre-cat oxygen sensors will cycle continuously between 1 and 900-millivolts once the PCM enters closed loop operation. If the catalytic convertor is operating correctly then the post-cat sensor signal should be fairly stable at around 0. Never do this to a front oxygen sensor because it will mess up the fuel system. Sensor 2 seems to sit at a constant 0. Oxygen sensor performance can be checked by reading the sensor's output voltage to make sure it corresponds with the air/fuel mixture (low when lean, high when rich). If the PCM determines that the post-cat o2 sensor signal voltage is below a certain threshold for too long, P0157 will set. > Upstream Oxygen Sensor Test: start the engine to enter KOER mode. 17 thoughts on “ O2 Sensor Simulator somenone” has a 2003 chevy s10 4. And the invoice with the new post-cat one I have on my desk lists it as a "new premium high performance O2 oxygen sensor Lexus Toyota. The heating element should have battery voltage on one wire with key on engine off and ground should be present. Stating around model year 1999, a new type of converter came on the market, called "Low Oxygen Storage Converter" or LOC. The upstream O2 sensor should be constantly changing between a rich/lean condition but the downstream O2 should be more stable with a tendency to a lean mixture. The sensor produces a voltage that changes when the amount of unburned oxygen in the exhaust changes. The PCM (Powertrain Control Module) compares the post-cat o2 sensor to the pre-cat o2 sensors to measure the cat’s efficiency. 17512 P1104 O2 Sensor Circuit (B1-S2) Voltage Too Low - Air Leak Yes, just change the o2 sensor post cat That is sensor 2. 5L afr sensors there are 2 upstream afrs, what is the normal voltage range of them? than the 2 downstream o2 sensors are they used to fine tune the fuel control,or just to see the health of the cat?. The pre-cat O2 reading looks freaky. The cat smooths out those fluctuations in the O2 content of the exhaust gas mixture. My mileage. The upstream O2 sensor should be constantly changing between a rich/lean condition but the downstream O2 should be more stable with a tendency to a lean mixture. The vehicle had repeatedly returned with a code of P0031—O2 sensor B1S1 low current flow heater circuit failure (open circuit). Voltage codes can be caused by sensors that are bad and stuck lean or rich. That is the cylinder 2,4,6,8 bank, or port on a vdrive, pre-cat sensor in the manifold. If you use the multimeter. The sensor voltage should cycle or fluctuate within the 100 mV-900 mV (0. ( Run the engine at 2000 RPM for 1 min. 2005 toyota hiace P0420. The HO2 sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level. They are there only to monitor the performance of the catalytic converters. If you find the heater element bad, replace the sensor. The o2 sensor's voltage should fluctuate within the 100mV - 900mV (0. The ecu with a narrowband o2 sensor, when in closed loop mode, will then lean on the fuel map if it is receiving a rich signal from the o2 sensor till its stoic. I've replaced my post cat Lambda sensor with one of these, due to a P0160 code (bank 2 post cat issue), now the car is giving P0050 and P0154 errors (bank 2 pre cat issue). When the rpms are increased the voltage fluctuates slightly and then settles to. I am not certain if this means that it just has no voltage or perhaps there is an electric issue in the wiring leading to the o2 sensor. The O2 sensor measures the oxygen content of the exhaust. Yeah, knowing the exact code would help. Length = 475mm (about 18. The performance of the O2 sensor tends to diminish with age as contaminants accumulate on the sensor tip and gradually reduce its ability to produce voltage. By rapidly changing the air/fuel mixture back and forth, the overall mixture averages out and keeps emissions at a minimum. The sensor measures the oxygen content of the exhaust gases and compares it to the oxygen proportion in ambient air, and sends information on the gases to the engine computer. Once they start creating voltage the ecm looks at the voltage and the engine should go into closed loop. Thanks for the info. Post by Hondata » Mon Aug 25, 2008 10:22 pm A wideband sensor must be matched to the controlling electronics. A bad sensor is indicated by fluctuating over or under 1 volt for long periods of time or when it is stuck at a certain voltage( i. The O2-2 reads in milliamps, not volts. They are there only to monitor the performance of the catalytic converters. The l 1 reference voltage for the sensor is 450 mV the same as the thimble-type sensor. Symptoms Usually rear o2 sensor problems won't cause drivability issues since they are an input that measures catalyst efficiency (unlike front o2 sensors). That’s why they’re also called “wideband” O2 sensors. The computer compares the readings from the (O2) sensor (pre cats) and the monitors (post cat) to determine if the catalytic converters are doing their job and "cleaning" the exhaust. Post cat O2 sensor mix up after downpipes Hey I guess. Can I just buy 2 o2 sensors? Some companies say "pre o2" while others say "replacement o2 sensor" ((Because I know some one will ask even though it has little to do with the Q *suzuki aerio sx 2003)). Hooked my laptop to it with autoenginuity and monitored the live data for the 2 sensors. If the converter efficiency is poor (because of contamination), the downstream O2 sensor output will seem like the upstream O2 sensor output; that is the post cat oxygen sensor will change extra ceaselessly between lean and rich voltage levels just like the pre cat oxygen sensor. 90 Volts - Rich mixture) and if the oxygen content is high it produces a low voltage (0. 2l by voltage measurement waveform simulation. Voltage is steady at steady throttle. Additionally, CODE PO158 is for the O2 sensor AFTER your cat. And check the downstream sensor voltage (02B1S2(V) 0. Make sure there are no engine problems first, otherwise the new converter will be damaged. The case studies we will focus on will look at pre-cat oxygen sensor codes, both caused by parts other than the O2 sensors. That may include but is not limited to vehicles from Honda, Ford, Mazda, VW, Mercedes-Benz, Audi, Hyundai, Acura, BMW, etc. So, With information from the (O2) Oxygen Sensor and other sources the (ECU) can decide whether the air/fuel ratio of your engine is rich or lean. Wrong O2 Sensor- If you are getting P0138 after having recently replaced your Oxygen sensor, it may be that the replacement is wrong or bad. The other is post cat or sensor number 2. Signal, Oxygen sensor before Cat. So, if the voltage output of the O2 sensor stays fixed (when testing it), the O2 sensor has failed. URD Rear O2 Sensor Simulators are carefully calibrated to condition the signal from the rear O2 sensor to keep it in the range the ECU is expecting. Replace the O2 sensor now if you don't want to replace the cat converter sooner. Drove from cold 16 klm, stop forXXXXX6 klm then MIL and P0420 came back. The efficiency of catalyst operation is determined by evaluating the oxygen consumption of the catalytic converters using the pre and post oxygen sensor signals. Find out what the code means before leaving any feedbacks. A standard oxygen sensor measures neither oxygen nor fuel content in exhaust gasses. Understanding CAT - Catalytic Converters. However, by taking the oxygen sensor off, you are able to visually inspect the sensor, which can often provide a good indication that there is a problem, and testing the sensor is also a little easier. The higher the number of O2 cross counts, the better the sensor and other parts of the computer control system are working. Specified value: 2.

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