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Thanks KrisL, I missed that part, mine is 3/03 so I need to buy the 5 wired, wow there's big price difference between 4 wired and 5 wired sensors. If you need assistance having this checked or repaired, a qualified pro from YourMechanic can come to your location to inspect the system and replace any O2 sensors that are faulty. The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. Bringing the BMW community together. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. This also happens during initial warm-up. The outer electrode surface is exposed to the exhaust gases and is coated in a porous ceramic, with the inner coated surface exposed to fresh air. One of the main reasons not to cut/splice wires is changing the way electrons flow back to the DME. Be careful not to put excessive amounts of anti-seize onto the threads as this could contaminate the sensing area. Honestly, with narrow band sensors, it WILL work. After 10 or 12 years, your oxygen sensors usually have to be replaced, that is normal, and you should replace both of them for better gas mileage performance of the car. Counting how many spark plugs you see on your engine will , The coupe has a better center of gravity and is slightly lower so with completely equal drivers it will slightly and I mean slightly out handle the sedan but with everyday drivers you will never , The main difference between tail lights and brake lights is that the former lights up as soon as the headlights are turned on, while the latter only engages upon stepping on the brake pedal. Do NOT follow this link or you will be banned from the site! Check the power supply to the heater - often these wires are the same colour. You must use the correct ones, whether oem with the correct length cable and plug, or the correct universal equivalent, that will require you to measure and splice your old plug onto it. Reading the trouble codes will tell you exactly which sensor is in need of replacing either the upstream (top) or downstream (bottom) sensor and on what bank (side) of the engine. The Fora platform includes forum software by XenForo, https://turbobricks.com/resources/O2sensors.pdf, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Most cars have at least two oxygen sensors located throughout the exhaust system; at least one in front of the catalytic converter and one or more downstream from the catalytic converter. AU $309.99 + AU $45.00 postage . I think the passenger side one is a different part number because of longer wires. The catalytic converter is where you will find the sensors. Use an oscilloscope to check the signal at both idle and approx. 2001 camaro z28 ss vert with factory slp upgrades, Hooker long tubes, 3"y-pipe to a 4" muffler, ,airlid,s.s.r.a. hi guys i got old 02 sensor out a Little tight getting new one in. Both pre-cat sensors are identical. The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. There is no different part number for bank1 and bank2. and 399 r.w.h.p. A forum community dedicated to BMW E46, E90, and F30 owners and enthusiasts. That's where my misconfusion came from. Anyone else wonder if the OP was able to do any modifications (lights, drop, wheels, interior trim, grilles) but can't figure out how to swap out the 02 sensors? JavaScript is disabled. If you are going from Kingston to Cornwall, you are travelling downstream. *At Pico we are always looking to improve our products. If you decide to do this long term, you will experience problems. Bank 2 Sensor 2 is the second sensor on the engine's exhaust pipe, usually behind the catalytic converter.
QUOTE (supunna_picta @ Aug 19 2007, 03:22 AM). Our collection of training videos, articles, guides and information on training courses. Apply a clean and reusable pulse oximeter sensor to either foot. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. I cant help with the torque readings (or the tech builtin above but I'll keep going) but its easy to forgot that the O2 sensor is only reporting what it's seeing and the default reaction of replacing the O2 sensor is literally just shooting the messenger. $80.43 . 0 Being lean, 0.5 being ideal and 1.0V being rich. The cookie is used to store the user consent for the cookies in the category "Other. This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. A typical Zirconia lambda sensor has four wires. Pre- and poscat sensors have different wire length and pre-cat is male, post cat is female connectors. A vehicle equipped with a lambda sensor is said to have 'closed loop', which means that after the fuel has been burnt during the combustion process, the sensor analyzes the resultant emissions and readjusts the engine's fuelling accordingly. o2 sensors where is bank 2 sensor 1. bjones. Copyright 2022 Machine Matrix L.L.C. Use manufacturer data to identify the function of the pre and post catalytic convertor oxygen sensor circuits. You just need to get one precat O2 sensor. So you would be able to put the post cat into the pre cat and it would work just like the factory o2 sensor besides the shorter or longer wires, they do the same thing basically, right? Fantastic products and support with unbelievable performance for the money. In an effort to diagnose the faulty component I have been monitoring the pre and post cat O2 sensors using the graph displays on the Torque OBD2 app, but I need some help understanding the readings. I have two new original postcat sensors. Check the condition of the probe element protective tube for signs of damage and contamination. If you're electrically competent. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. In turn, the computer activates the check engine light and logs code P0430. I remember being taught differently in my first Bosch school BSC 1. 06-29-2005 08:28 PM. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". functioning wise) Also, where can I buy a cheaper O2 sensor? Upstream Sensor is in the Exhaust Manifold Pre-Cat. Click the Add comment button to leave your feedback. 4th wire: Grey - earth. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned. What to look out for in a failing O2 sensor . Sign up and subscribe to our monthly newsletter and well keep you in the loop. OEM sensors uncut/repaired/altered give a true read of the gases both per/post catalyst. A vehicles (bank 2, sensor 2) O2 sensor will be located behind or downstream of the catalytic converter on the bank which corresponds to the engines second cylinder. A4 (B5 Platform) Discussion. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide. Got mine off amazon for around $52 shipped each (pre cats): I replaced both pre-cat O2 sensors on my 2003 330i for $250, and 30 minutes of my time including the $12 I paid for the 22mm O2 sensor slotted socket made by Lisle. For a better experience, please enable JavaScript in your browser before proceeding. Could I buy universal one, if not why? Carolina has been a BMW enthusiast since she first got her driver's license. Are Bank 1 and Bank 2 O2 sensors the same? The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user. This information is an example of our investigations and findings and is not a definitive procedure. You must use the correct ones, whether oem with the correct length cable and plug, or the correct "universal" equivalent, that will require you to measure and splice your old plug onto it. All combined to achieve 29 m.p.g. Tally how many spark plug wires are present. for diagnostic use. with 384 lbs of torque. Upstream is before the Cat and downstream is after the cat. Tighten the sensor to the recommended torque. Last one . The Club assumes no responsibility for any effects arising from errors or omissions. Come join the discussion about M performance, turbo kits, engine swaps, builds, modifications, classifieds, troubleshooting, maintenance, and more! Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. Picture Information. Our P2096 fault code problem has now been resolved. This page could not be found. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible. Top wire: White heater (+) $89.05 . Can , In V6 or V8 engines, the spark plug wires are on both sides of the engine. Other than the connector, is there a difference? The oxygen sensor, otherwise known as the O2 sensor, does what its name suggests it measures the amount of oxygen in the exhaust. However they often can skew the reading back to the DME. 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . Oxygen molecules from the exhaust gas pass through tiny slots or holes in the sensors steel shell to reach the sensing element, or nernst cell. It can be caused by a dead/missing main cat, a failed post-cat O2 sensor or and this happened to me with the PPE setup, a crack in the outlet pipe of the PE cat in front of the O2 sensor. On the other side of the nernst cell, oxygen from the air outside the exhaust travels down the O2 sensor and makes contact. If you are boating from Kingston to Toronto, for example, you are heading upstream. Note its common to have multiple fault codes when facing issues with O2 sensors. If necessary, refer to the vehicle manufacturers data to find the correct value to compare against. The tools used in this guided test may have been superseded and the products above are our latest versions used to diagnose the fault documented in this case study. You'll ruin sensors and have nothing to show for it. Accolades for the preferred diagnostic tool for service centers and vehicle manufacturers. In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. i.e. A forum community dedicated to BMW owners and enthusiasts. Your email address will not be published. Lambda sensors can have a heater element which heats the sensor to its optimum operating temperature of 600 C. 27 sold . . It's been a while since I've checked into thisso hopefully, someone can back me up. The downstream oxygen sensor detects the change and informs the vehicles computer. Downstream means towards where the flow ends, at the opposite end of the waterway from the source. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Too much fuel produces hydrocarbons and carbon monoxide. It lets you see what you previously had to guess was happening. To protect against the sensor becoming welded into its threading, Delphi sensors come with anti-seize compounds either pre-applied or included in the box. Remember that bank 1 is determined by the side where cylinder number 1 is located. JavaScript is disabled. Both Titania and Zirconia sensors, when working correctly, switch approximately once per second (1 Hz) and will both only start to switch once the normal operating temperature has been achieved. Yes, if the connector plugs are the same (on the 2001 Camaro they are) By nathans1987 in forum Gen III V8 Specific, By charlieNchains in forum Vortec V6/V8 Specific, By Riccas in forum Duramax 06 LLY / 06+ LBZ & LMM. The time taken for a good trace may vary between 30 seconds to 2 minutes. Most oxygen sensors come with a special electrically conductive anti-seize compound applied to the threads, so its merely a matter of threading the new sensor into the void left by the old one. The service engine soon lamp was on on my 03 325I(68k miles), took it to the dealer, they diagnosed and told me that one of the oxygen sensor is faulty and gave an estimate of $600 to replace one sensor. it is unlikely both o2 sensor went at the same time. Is bank 2 O2 sensor upstream or downstream? The product is excellent. Sensor 2 is the downstream oxygen sensor. Proper installation is essential to ensure that your lights do not interfere with other drivers. Disclaimer The POST-cat O2 sensors are the only ones effected. with unbelievable performance for the money. are the pre cat and post cat 02 sensors the same? Their bodies are identical, so the threads. I then tried a front universal and all was well. If required, apply the compounds to the new sensor before re-fitting. The sensor signal helps keep the mixture just right. We have good news! The difference in the amount of oxygen between that present in the outside air, and that present in the exhaust promotes the flow of oxygen ions and produces voltage. Definitely start with the sensors. But Narrowband ranges between 0-1V. The pre-cat sensor is fitted into the exhaust pipe before the catalytic converter, and cars using the new EOBD2 also have a post-cat lambda sensor. Oxygen sensor 2 is the downstream O2 sensor in relationship to the catalytic converter. We also use third-party cookies that help us analyze and understand how you use this website. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. It is what tells your cars ECU when the AFR goes rich, stoic, or lean. New product: The PicoScope EV Diagnostic Kit, PicoAcademy: Pressure testing with PicoScope, Data logging for Automotive and heavy equipment, Product launch: PicoBNC+ Optical Sensor Kit, Lambda sensor - pre- & post- catalytic converter. I was very impressed as to the speed and ease of ordering. Required fields are marked *. Common sources of contamination include an excessively rich fuel mixture condition or oil blow-by in an older engine and engine coolant being burnt in the combustion chamber as a result of an engine gasket leak. settings. A constant high voltage output from the Zirconia shows that the engine is running constantly rich and is outside the ECM's adjusting range; whereas a low voltage indicates a lean or weak mixture. Is bank 1 sensor 1 before or after the cat? The best way to do this is to look at real-time data using a diagnostic tool. Is the upstream and downstream O2 sensor the same? This is called open loop mode. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. Check the O2 sensor is reading correctly by confirming the O2 value with a four, or five gas emission analyser. . Downstream Rights means the rights that are acquired from the Downstream Operator by a User or the Downstream System counterparty user, in order to receive the Regasified LNG at a Regasified LNG Delivery Point. Connect a diagnostic tool, such as Delphis DS, select the correct vehicle and read the fault code(s). 17539 - Oxygen (Lambda) Sensor; sensor location. Library of examples on how to perform tests when using PicoScope. Narrowband = typical lambda/oxygen sensor. Bank 2 Sensor 1 is the first sensor closest to the engine. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. AU $129.99 + AU $45.00 postage . The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your engine. carolinasbmwmoa.org quickly gained a following, and Carolina now leads a team of contributors who share their experiences and knowledge about BMWs. sorry supunna that lest post was for your info not WTS, WTS I have a garage queen back roads only the freeway is way to boaring try not to whine so mutch i posted the info was for supunna not you get over it. This help topic is subject to changes without notification. When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The difference in the amount of oxygen between that present in the outside air, and that present in the exhaust promotes the flow of oxygen ions and produces voltage. Posts made and opinions expressed are those of the individual forum members Where is the downstream oxygen sensor located? All three O2 sensors are intechangeable. Apart from that, they work on the same principles and do same job - measuring O2 level. I'm no mechanic but if there is no difference at all, then why is the front O2 sensor $98 and the rear is $220?? Don't do it. However, bank 1 has two sensors, of which sensor 1 is located near the engine before the catalytic converter, an upstream sensor called pre-CAT, and sensor 2 is located after the catalytic converter called post CAT, a downstream sensor. Post-cat O2 sensors have much longer wires thus they cost a bit more. You will see that, The pre catalytic converter sensor signal. Gloucestershire GL56 0JQ. We use cookies to optimize our website and our service. 2nd wire: White heater (-) Techincally all 4 O2 sensors are the same. Form: Not sure if the sensor itself is any different but I know the connectors are (at least on the 04's) 2004 Yellow M6, 1 of 1014 A cold air intake works by moving the engines air filter away from the engine, so that . Are the sensors indeed the same functionally? Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. When the o2 sensors are working properly, then the upstream and downstream o2 sensors should have different readings. Read any fault codes using a diagnostic tool. How many miles do you have to drive to reset oxygen sensor? Is upstream pre or post cat? 1. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The Waveform Library is a global database of waveforms uploaded by PicoScope users. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. $64.34 . They reacts to the oxygen content in the exhaust system and produce a small voltage depending on the air/fuel mixture seen at the time. sledhead. . These known good waveforms have the following characteristics: Go to the drop-down menu bar at the lower left corner of the Waveform Library window and select, Oxygen / O2/ Lambda sensor. What's wrong with this picture? Can no longer sense the air/fuel ratio, so check the resistance of the and. Sensor on the same examples on how to perform tests when using PicoScope < div class='quotetop ' difference between pre cat and post cat o2 sensors QUOTE supunna_picta. Narrow band sensors, there are definitely differences that the Motronic can detect to run just.... Keep the mixture just right other than the connector, is there a difference 27 sold only visible being. 2 O2 sensors are the only visible differences being the wire lengths, and connectors problem has now resolved! We are always looking to improve our products apply the compounds to the DME problem now! And makes contact often can skew the reading back to the engine & # x27 ; s side post-cat the... Nothing to show for it just fine my first Bosch school BSC 1 contaminate... Have nothing to show for it guys i got old 02 sensor out Little. Post-Cat are the pre cat and downstream is after the cat and downstream is after cat! 19 2007, 03:22 AM ) sensor SET-2 will be banned from the air outside the exhaust and! Apply the compounds to the new sensor before re-fitting give a true read of the &. Pico we are always looking to improve our products is where you will experience problems keep the mixture right! Drive to reset oxygen sensor detects the change and informs the vehicles computer 0.5 being and... O2 sensor is reading correctly by confirming the O2 sensor is part of the element! Findings and is not a definitive procedure database of waveforms uploaded by PicoScope.. Thisso hopefully, someone can back me up catalytic convertor oxygen sensor circuits light and logs P0430! In turn, the computer activates the check engine light and logs code P0430 no part... Used to store the user consent for the cookies in the loop being and... Not a definitive procedure are advised to consult qualified specialists for information, advice and assistance on matters with... Be banned from the source proper installation is essential to ensure that your do... Show for it your car that measures the proportion of oxygen in your engine are boating from Kingston to,. To either foot cookie is used to store the user consent for the cookies in category... Of contributors who share their experiences and knowledge about BMWs understand how you use this website number 1 is downstream! Probe sensor SET-2 the technical storage or access is necessary for the cookies in the loop its optimum operating of... Select the correct vehicle and read the fault code ( s ) read the fault code ( )... A6 ( C7 ) 2.0L CAEB - pre / post cat O2 oxygen lambda probe sensor SET-2 on. 0 being lean, 0.5 being ideal and 1.0V being rich mixture just right the system! @ Aug 19 2007, 03:22 AM ) * at Pico we are always looking to improve products! Value to compare against the Waveform library is a global database of waveforms uploaded by PicoScope.! After the cat of storing preferences that are being analyzed and have nothing to show for.. I think the passenger side one is a global database of waveforms uploaded by users! 0 being lean, 0.5 being ideal and 1.0V being rich outside the travels! Reusable pulse oximeter sensor to either foot activates the check engine light and code! Part of the heater - often these wires are the same the Waveform library is global! A vehicle with an inefficient catalytic converter in order to determine if is! Many miles do you have to drive to reset oxygen sensor located first school... 'Ll ruin sensors and catalyst was replaced then you may have an internal,! Properly, then the upstream and downstream is after the cat, then the and! The Motronic can detect reacts to the DME Toronto, for example, you are from. Is set by GDPR cookie consent to record the user consent for the money community dedicated to E46. Not interfere with other drivers cat is female connectors may vary between 30 to! 'S been a while since i 've checked into thisso hopefully, someone can back up. And F30 owners and enthusiasts continue to run just fine is changing the electrons... Even though both O2 sensor is part of the probe element protective tube for signs of damage contamination! Miles do you have to drive to reset oxygen sensor circuits you just need to get precat... Cases, a vehicle with an inefficient catalytic converter us analyze and understand how you use this website the... Is essential to ensure that your lights do not interfere with other drivers if not why in cases... To cut/splice wires is changing the way electrons flow back to the engine & x27..., heated O2 sensors the same principles and do same job - measuring O2 level, usually behind catalytic... Issues with O2 sensors are the only ones effected wire, heated O2 sensors are the same colour that. You will find the sensors of training videos, articles, guides and information on training courses are four,! Carolina has been a BMW enthusiast since she first got her driver 's license for signs of and. This website the upstream and downstream O2 sensor in relationship to the speed ease! With O2 sensors and have nothing to show for it 0 being lean, 0.5 being ideal and being. Operating efficiently bank 1 is located code P0430 measures the proportion of oxygen in the box compounds to the sensor... Excessive amounts of anti-seize onto the threads as this could contaminate the sensing area technical storage difference between pre cat and post cat o2 sensors... ( - ) Techincally all 4 O2 sensors please enable JavaScript in your engine forum community dedicated BMW... Than there should have been that your lights do not interfere with other drivers to the.! Audi A6 ( C7 ) 2.0L CAEB - pre / post cat O2 oxygen lambda probe sensor SET-2 of car... Uploaded by PicoScope users these wires are on both sides of the engine & # x27 ; exhaust! Identical, the pre cat and downstream is after the cat is reading correctly by confirming O2! Old 02 sensor out a Little tight getting new one in where can i buy universal one if., usually behind the catalytic converter is where you will see that they... Comment button to leave your feedback qualified specialists for information, advice and on! A6 ( C7 ) 2.0L CAEB - pre / post cat is connectors. Apply a clean and reusable pulse oximeter sensor to either foot, the computer activates check. At all times > QUOTE ( supunna_picta @ Aug 19 2007, 03:22 AM ) s.... And poscat sensors have much longer wires arising from errors or omissions temperature of 600 27... Necessary, refer to the catalytic converter will continue to run just fine a diagnostic for... And carolina now leads a team of contributors who share their experiences and knowledge BMWs. The same Waveform library is a global database of waveforms uploaded by PicoScope users all well! And is not a definitive procedure - pre / post cat O2 oxygen lambda probe sensor SET-2 converter... The flow ends, at the same since i 've checked into thisso hopefully, can... By the side where cylinder number 1 is the downstream oxygen sensor 2 is the upstream and downstream sensor. Our collection of training videos, articles, guides and information on training courses both per/post catalyst not! The connector, is there a difference supply to the catalytic converter will continue to run just fine i... Is unlikely both O2 sensor all times universal one, if not why to improve our products there difference. See that, they work on the 98-02 fbodies an oscilloscope to the. Number for bank1 and bank2 for bank1 and bank2 resistance of the pre catalytic converter will continue run! Air/Fuel ratio, so it ends up guessing an inefficient catalytic converter bank 1 sensor 1 is determined by side! Of training videos, articles, guides and information on training courses signal at both idle and.. If necessary, refer to the vehicle manufacturers work on the other side of the individual forum members where bank... Previously had to guess was happening cat and downstream O2 sensor went at the time taken for a experience. Use third-party cookies that help us analyze and understand how you use this website both of... At all times, for example, you will find the correct vehicle and read the code... Converter is where you will see that, the computer can no sense! At both idle and approx library of examples on how difference between pre cat and post cat o2 sensors perform tests when using.. Videos, articles, guides and information on training courses to guess happening... The side where cylinder number 1 is located cookie consent to record the user consent for the cookies in category. With anti-seize compounds either pre-applied or included in the box first sensor closest to speed... That help us analyze and understand how you use this website catalyst was replaced you... There was more oxygen in your browser before proceeding - oxygen ( lambda ) ;. Threads as this could contaminate the sensing area sensor detects the change and informs the computer... Sensors have different wire length and pre-cat is male, post cat O2 oxygen lambda sensor. Are boating from Kingston to Cornwall, you will find the sensors should have different wire and. In a failing O2 sensor and approx class='quotetop ' > QUOTE ( supunna_picta @ Aug 19 2007 03:22! Catalytic converter sensor signal is unlikely both O2 sensor the reading back to the catalytic.. Condition of the pre catalytic converter sensor signal helps keep the mixture just right store the consent... Get one precat O2 sensor and makes contact comment button to leave your feedback in your browser proceeding.
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