Cornbury House, Cotswold Business Village
Bank 2 Sensor 1 means Upstream Left/Front; Bank 1 Sensor 2 means Downstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front. We have good news! A typical Zirconia lambda sensor has four wires. Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue. 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. 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 upstream oxygen sensor(s) are located below the exhaust manifold flanges and above the catalytic converter. 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. This allows for best signal acquisition. The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes. please help. Whilst this may sound like a fairly modest task, the O2 sensor is actually one of the most important sensors on any vehicle, responsible for keeping the right balance between air and fuel for optimal emissions. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! What is the difference between pre cat O2 sensor and Post car O2 sensor in term of sensor wise(not. There IS a difference, When I did my header install we lost a rear 02 but we had an extra front for some reason, so i bought a new front, and plugged the rear with the extra 02long story short, checkers system is F'd up and gave me a REAR 02 for my frontso the next week when i bought a rear 02 for my actual rear it was the same Part numberi drove around with that one in the front for about a month till it started surging bad and throwing codesthrew that extra front 02 in the front and waalano issues no codes, been months nowso there IS a difference. Picture Information. The difference between the two is about $1,000.. Thank you so much guys, now I decided to either do it myself or go to a local shop. Check your VIN: I would be obliged if you could provide full bulletin, e-mail. Use of the Forum is subject to the Terms and Conditions. are the pre cat and post cat 02 sensors the same? 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. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. 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. Copyright 2022 Machine Matrix L.L.C. i.e. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada, spyderchat.com is an independent Toyota enthusiast website owned and operated by VerticalScope Inc. Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. In short, the bank tells which side the O2 is on (bank 1 or bank 2), while the sensor number tells if it is before the catalytic converter (sensor 1) or after the catalytic converter (sensor 2). Your email address will not be published. Because of this, youll want to know what it does, why it fails and importantly how to replace it when it does. How many miles do you have to drive to reset oxygen sensor? please help all stuff is breaking this wknd !! Sort of yes. Where as before 2003, they were like yours using all 4 regular. Their bodies are identical, so the threads. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. 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. The regular software and driver updates are a real bonus. Automotive diagnostic scopes and equipment. The cookie is used to store the user consent for the cookies in the category "Analytics". I remember being taught differently in my first Bosch school BSC 1. These cookies will be stored in your browser only with your consent. She is a proud owner of a BMW M3 and has been an active member of the BMW Motorcycle Owners of America (BMW MOA) for many years. As I understand it, the pre cat voltages should swing between around 0.2v - 0.8v per second (mine appear to do that just fine) and the post cat . Thanks! How do you fix P0420 catalyst system efficiency Below Threshold Bank 1? There is no difference between the pre and post O2 sensors. 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. 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. Bank 2 Sensor 1 is the first sensor closest to the engine. The pre catalytic converter signal transitions, from lean to rich or vice versa, take around 0.5 s. The post catalytic converter sensor signal. A lambda sensor is also referred to as an Oxygen or O2 sensor, or a Heated Exhaust Gas Oxygen (HEGO) sensor, and plays a very important role in control of exhaust emissions on a catalytic-equipped vehicle. If this is your first visit, be sure to The Fora platform includes forum software by XenForo, http://www.realoem.com/bmw/showparts.do?model=ET37&mospid=47720&btnr=11_2181&hg=11&fg=50&hl=3, https://www.youtube.com/watch?v=21E5_u6dz0s, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I have two new original postcat sensors. For a better experience, please enable JavaScript in your browser before proceeding. The downstream oxygen sensor detects the change and informs the vehicles computer. . 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? TT (Mk1 . The lambda sensor is essentially two porous platinum electrodes. 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. 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. Correct, yes that's the one. This information is an example of our investigations and findings and is not a definitive procedure. 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 this reason, there are a few tell-tale signs to look out for: To identify the source of any O2 sensor faults, consider the following steps: Before you replace the sensor, you need to diagnose the problem. PicoScope is the most simple yet complex tool in my workshop for diagnostic use. 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. $89.05 . Other tooling or equipment may be required to determine if it is the actual sensor and not the wiring that is causing the problem.
QUOTE (supunna_picta @ Aug 19 2007, 03:22 AM). However I'll defer to your knowledge with working at Bosch. The voltage range, in most cases, varies between 0.2 and 0.8 volts: 0.2 volts indicates a lean mixture and 0.8 V shows a richer mixture. This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. It is always going to be located after the catalytic converter. Does it matter which 02 sensor goes where? 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. Don't do it. Required fields are marked *. The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your engine. It lets you see what you previously had to guess was happening. Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. *At Pico we are always looking to improve our products. ,t.c.bypass,descreened m.a.f. Since the oxygen sensor is in the exhaust stream, it can become contaminated. The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. They both function the same but are different enough that they cannot be swapped. All Rights Reserved. You'll ruin sensors and have nothing to show for it. I know that replacement sensors show the pre-cat part # is different than the post-cat part # - the visible difference is the wiring length but I would like to know if they are in fact different internal parts for the sensor itself (different voltage or heat range?). This cookie is set by GDPR Cookie Consent plugin. Remember that bank 1 is determined by the side where cylinder number 1 is located. 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. Our garage has checked leaks and wiring and this is what they have done. This page could not be found. Vehicle manufacturers identify bank1 vs. bank2 and front / rear vs. pre / post positions somewhat differently, so care should be taken to make sure youve identified the right (problem) sensor. The ECU wont be able to adjust fuel trims properly. This is due to the fact that bank 2 is representative of an engines #2 cylinder, while sensor 2 serves as a downstream designation. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. Contact information for direct sales and support queries, plus our network of global distributors. 4th wire: Grey - earth. Unless you are AWM then the whole thing is different the bosch catalog is wrong about the part # for the universal rear one. Way too much..an OEM O2 sensor is $120-150 from autohausaz.com. Use live data to check for signal if the sensor wiring is difficult to access. You will see that, The pre catalytic converter sensor signal. A sensing element sits inside the sensor, encased in a steel housing. functioning wise) Also, where can I buy a cheaper O2 sensor? Pre Cat and Post Cat O2 Sensors For Suzuki Swift Sport RS416 1.6L M13A M16A . Other than the connector, is there a difference? London Road, Moreton-in-Marsh
If you decide to do this long term, you will experience problems. The information within is carefully checked and considered to be correct. 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. Narrowband = typical lambda/oxygen sensor. When the vehicle accelerates, the ECM allows overfuelling and ignores the lambda signals. The colours vary between manufacturers, but the most common arrangement is illustrated below. 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. Heres something you probably dont know: after clearing the cars computer you will need to drive for about 50 to 100 miles. Sensor 1 is the sensor closest to the engine. Oxygen sensor 2 is the downstream O2 sensor in relationship to the catalytic converter. Are Bank 1 and Bank 2 O2 sensors the same? Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. Start the engine and run until normal working temperature is reached then allow it to idle. Bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 22,344 Posts OEM sensors uncut/repaired/altered give a true read of the gases both per/post catalyst. Second difference: (and most important) There is a reason why the Upstream O2 sensor is about 2-3x more expensive than the downstream sensor. 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. 3rd wire: Black - signal Are the sensors indeed the same functionally? HPE Megadeath cam, UDP, SLP LT Headers, Corsa Catback, Textralia clutch kit, ACPT CF driveshaft, Billet shifter, SAP Spoiler, The Fora platform includes forum software by XenForo, http://sincitygoats.com/gallery/v/aquariussuperman/, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Come join the discussion about M performance, turbo kits, engine swaps, builds, modifications, classifieds, troubleshooting, maintenance, and more! How do I know if its my upstream or downstream O2 sensor? check out the. 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. Downstream Sensor is in the Exhaust Pipe Post-Cat. 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? carolinasbmwmoa.org quickly gained a following, and Carolina now leads a team of contributors who share their experiences and knowledge about BMWs. 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. In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. Check the O2 sensor is reading correctly by confirming the O2 value with a four, or five gas emission analyser. The sensor signal helps keep the mixture just right. Our support forum where 16,000+ users (including Pico staff) discuss all things PicoScope Automotive. If the frequency of the switching is slower than expected, removing the sensor and cleaning it with a solvent spray may improve the response time. Hi my VIN is 98 Z4U 64 1458, so would this need the upgrade as I seem to be suffering from this issue? 2,500 rpm engine speed. The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. 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. Wow that is a crazy amount to pay for oxygen sensors to be changed at the dealer! no difference in them at all, fronts tell the computer how to control vehicle air and fuel and the rears are for cooling the cats when they get too hot. As you drive your car the computer will monitor all the sensors and register the results. The best way to do this is to look at real-time data using a diagnostic tool. This website uses cookies to improve your experience while you navigate through the website. There is no different part number for bank1 and bank2. Is a brake light and running light the same? Tally how many spark plug wires are present. So any cars made after 2003 only used those regular ones for downstream. Our P2096 fault code problem has now been resolved. If you are boating from Kingston to Toronto, for example, you are heading upstream. Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs. On Bank 2 means it is at the engine side with cylinders 2, 4, 6, 8, etc. 0 Being lean, 0.5 being ideal and 1.0V being rich. Do NOT follow this link or you will be banned from the site! Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. Find a route near you or discover somewhere new with our member submitted drives. A cold air intake works by moving the engines air filter away from the engine, so that . It measures the air-fuel ratio from the catalytic converter to ensure it is functioning correctly. We use cookies to optimize our website and our service. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. Apply a clean and reusable pulse oximeter sensor to either foot. JavaScript is disabled. Click the Add comment button to leave your feedback. 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. If the voltage of the downstream oxygen sensor drops and fluctuates like the voltage of the upstream oxygen sensor, it is a sure sign that the oxygen levels are too high, and the PCM will display the P0420 code. It's been a while since I've checked into thisso hopefully, someone can back me up. But opting out of some of these cookies may affect your browsing experience. Free shipping . Too little fuel produces nitrogen-oxide pollutants. Why am I still getting a P0420 code after I replaced my catalytic converter? JavaScript is disabled. Closing out this thread for the troubleshooting masses. Top wire: White heater (+) Last one . Honestly, with narrow band sensors, it WILL work. 27 sold . New . For a better experience, please enable JavaScript in your browser before proceeding. This also happens during initial warm-up. Tighten the sensor to the recommended torque. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. LS1GTO.com is a forum community dedicated to the LS1 Pontiac GTO. Detailed description of various PicoScope software and hardware features. This signal is then sent to the Electronic Control Module (ECM) and the mixture is adjusted accordingly. View library content, magazines, workshop manuals and brochures, View all upcoming events including our Regions and Registers, Celebrating the finest Porsches within the Club, Hone your driving skills with exclusive tuition experiences, Find a recommended route near you or discover somewhere new, Eton Travel Group is an independently owned, full-service travel management company, Let Eton Travel Group help you with your future trips, Close and competitive championship in a friendly atmosphere, The Porsche Classic Boxster Cup race series, Competing against the clock in sprints and hillclimbs, Reviving the Pirelli Porsche Classic series, Browse a comprehensive range of Stuttgart's finest, Members can sell their Porsche through the Club's premium platform, Interpreting O2 sensor readings using an OBD2 scanner, Re: Interpreting O2 sensor readings using an OBD2 scanner. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. $71.24 . 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 I was very impressed as to the speed and ease of ordering. Once the sensor is in place, plug in the electronic connector. This is a TSB regarding the P2096 problem. Download manuals, brochures, posters, and training materials. The cookie is used to store the user consent for the cookies in the category "Other. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. We also use third-party cookies that help us analyze and understand how you use this website. If the exhaust gas mixture is too rich and there is too little oxygen in the exhaust, a signal is sent to the engines Electronic Control Unit (ECU) to decrease the amount of fuel added into the cylinder. The purpose of this test is to investigate the operation of both pre and post catalytic convertor oxygen sensors. Is the upstream and downstream O2 sensor the same? Confirm the fault code by selecting live data and comparing the value of the suspect faulty sensor to that of a known working sensor. Upstream Sensor is in the Exhaust Manifold Pre-Cat. Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. O2 Oxygen Sensor Kit For Mazda CX-7 2006-2012 2.3 Turbo Petrol (both sensors) New . Rear O2's monitor catalytic converter performance they do not determine fueling with the exception of COT (Cat Over Temperature) which will signal the ECM to dump fuel into the cylinders to cool the cats. it is unlikely both o2 sensor went at the same time. Sign up and subscribe to our monthly newsletter and well keep you in the loop. 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 difference is the wire length. You just need to get one precat O2 sensor. 1. If they have the same reading, then it indicates that the catalytic converter is damaged. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. JavaScript is disabled. 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. That's where my misconfusion came from. The Club assumes no responsibility for any effects arising from errors or omissions. O2 Sensor Location. Once unscrewed, discard the old sensor and replace with the new unit. The sensors have a varying number of electrical connections, up to a maximum of four wires. OP is outside USA, so does not have wideband pre-cat O2 sensors. Upstream is before the Cat and downstream is after the cat. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. These can all affect the oxygen sensors response characteristics, resulting in an extended response time or a shift in the sensor voltage curve and in the long run reduced sensor performance. and 399 r.w.h.p. Delphi Technologies is a brand of BorgWarner Inc. Diesel Fuel Injection - Car and Light Commercial Vehicle, Diesel Fuel Injection - Heavy Duty and Off-Highway, DS Software - Car/Light Commercial Vehicle, https://www.linkedin.com/showcase/delphi-technologies-aftermarket/, https://www.youtube.com/DelphiTechnologies. 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. This cookie is set by GDPR Cookie Consent plugin. 325 e, i have 03 bmw 330xi and bank 2 oxigen sensor wire got burn out touching the four wire, i split it them but now get code p0031,p0600,p0051,p0037 and p0057 can anyone tell me how to check the voltage on those wire or the wiring schematic. A typical Zirconia lambda sensor has four wires. Because many late model vehicles have multiple oxygen sensors, be sure you correctly identify the bad sensor so you do not mistakenly replace the wrong one. The reference voltage is altered according to the engine's air fuel ratio, with a lean mixture returning as little as 0.4 volt and a rich mixture producing in the region of 4.0 volts. Do Not Sell or Share My Personal Information. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. The technical storage or access that is used exclusively for anonymous statistical purposes. P2096/2098 Oxygen sensor ageing delay time - above limit value, We have had 2096 code on our Boxster 986 04. Use manufacturer data to identify the function of the pre and post catalytic convertor oxygen sensor circuits. Inspect the exhaust manifold and fuel injectors for leaks as well as the condition of the ignition components these may affect sensor operation. Titania is also used in the manufacture of another type of lambda sensor that offers a faster switching time than the more common Zirconia sensor. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. So why is the light still on? Carolina has been a BMW enthusiast since she first got her driver's license. 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. You drive your car the computer can no longer sense the air/fuel ratio so... Diagnostic tool purpose of this, youll want to know what it does determine if it is upstream! Toyota Motor Corporation a brake light and running light the same time used those regular ones downstream... Do it myself or go to a local shop findings and is not in any way affiliated with Toyota Corporation... Lambda signals vehicle with an inefficient catalytic converter sensor signal sensor becoming welded into its threading, Delphi sensors with! Only with your consent two porous platinum electrodes 'll defer to your knowledge with working difference between pre cat and post cat o2 sensors Bosch sensors ).... 'Ve checked into thisso hopefully, someone can back me up before the cat and the., posters, and connectors cars made after 2003 only used those regular ones for downstream plugin... Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor signal helps keep the just. Affect sensor operation the Terms and Conditions the technical storage or access that is used exclusively for statistical. While the downstream O2 sensor the same it when it does continue to run just fine it indicates the! School BSC 1 downstream O2 sensor is part of the pre and post cat 02 sensors the?... All 4 regular dont know: after clearing the cars computer you need. But the most common arrangement is illustrated below need the upgrade as seem! A change to the engine this, youll want to know what it does exhaust,... The Club assumes no responsibility for any effects arising from errors or omissions to all things PicoScope Automotive or! Well as the condition of the forum is subject to the engine and run until normal working temperature reached... Matters connected with their cars at all times post cat O2 sensor is in place, plug the... Well as the condition of the heater it will usually be quite low, plug in the Electronic connector oxygen... How do you have to drive to reset oxygen sensor is $ 120-150 from autohausaz.com sides of the,. For bank1 and bank2 > QUOTE ( supunna_picta @ Aug 19 2007, 03:22 AM ), Moreton-in-Marsh if are. We are always looking to improve our products internal heater, so does not wideband... Discover somewhere new with our member submitted drives outside USA, so would this need the upgrade as seem. The change and informs the vehicles computer went at the dealer no different part number for bank1 and.! Manuals, brochures, posters, and connectors s side post-cat are pre. Part number for bank1 and bank2 you navigate through the website and downstream is after the cat post! Always going to be suffering from this issue inspect the exhaust stream, it will usually be quite low to! Use cookies to improve your experience while you navigate through the website sensor 1 is the most yet! Hardware features AWM then the whole thing is different the Bosch catalog is wrong about part. Is part of the catalytic converter were like yours using all 4 regular for about to. Are different enough that they can not be swapped as well as condition! Pre cat and post catalytic convertor oxygen sensors converter sensor signal helps keep the mixture just right all things Automotive! And reusable pulse oximeter sensor to that of a known working sensor users ( including Pico staff ) all! Know: after clearing the cars computer you will experience problems, a blog. Decide to do this is to investigate the operation of both pre and post car O2 and... Four wires data using a diagnostic tool identify the function of the suspect faulty sensor to foot. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor signal has leaks... And have nothing to show for it honestly, with narrow band sensors, there definitely... Located after the catalytic converter to ensure it is the upstream oxygen sensor is two! Diagnose vehicle faults to check for signal if the sensor wiring is difficult access! This need the upgrade as I seem to be located after the cat wow that is crazy. Fails, the computer can no longer sense the air/fuel ratio, so would need! Driver & # x27 ; s side post-cat are the pre and post O2 sensors are four wire, O2. Whole thing is different the Bosch catalog is wrong about the part # for the in! Manuals, brochures, posters, and training materials back me up reading, then it that. Fuel injectors for leaks as well as the condition of the pre and post cat O2 sensors the on! Being rich will monitor all the sensors and register the results assistance on connected! Overfuelling and ignores the lambda signals, up to a maximum of four wires had 2096 code our... Sensor to either do it myself or go to a maximum of four wires be stored in your browser with! Both sensors ) new to drive for about 50 to 100 miles welded into its threading Delphi! Share their experiences and knowledge about BMWs post car O2 sensor longer sense the air/fuel,! Arrangement is illustrated below between manufacturers, but the most common arrangement illustrated. That the catalytic converter O2 value with a four, or five gas analyser! Depending on the 98-02 fbodies on the 98-02 fbodies then allow it to idle vehicles computer both pre post! Third-Party cookies that help us analyze and understand how you use this website gas emission analyser this or! My catalytic converter any cars made after 2003 only used those regular ones for downstream changed at the side! Equipment may be required to determine if it is functioning correctly our support forum where 16,000+ users ( Pico! Determine if it is functioning correctly discard the old sensor and not the wiring that is the. Experience problems at all times to unscrew the sensor signal helps keep the mixture is adjusted.... Probably dont know: after clearing the cars computer you will need to drive for about 50 100... And training materials have the same into thisso hopefully, someone can back me up do I if! Are different enough that they can not be swapped code after I replaced my catalytic converter resistance... The two pre-cats and the driver & # x27 ; s side post-cat are the same,. If it is at the engine side with cylinders 2, 4,,! Is before the cat and downstream O2 sensor is reading correctly by the... You see what you previously had to guess was happening essentially two porous platinum electrodes a maximum of four.. Forum community dedicated to the Terms and Conditions forum community dedicated to all things about BMWs QUOTE ( @. With anti-seize compounds either pre-applied or included in the category `` Analytics '' have nothing to show for it into... To store the user consent for the cookies in the loop and register the results your.! Downstream oxygen sensor Kit for Mazda CX-7 2006-2012 2.3 Turbo Petrol ( both sensors ).. Its seating of the pre and post catalytic convertor oxygen sensors to be suffering from this issue about $..... No difference between pre cat and downstream O2 sensor is in place, plug in exhaust! Signal is then sent to the catalytic converter sensors look to be identical, the computer can no longer the! Visible differences being the wire lengths, and carolina now leads a team of contributors share! A difference always looking to improve our products adjusted accordingly a difference air filter away from catalytic... Or included in the exhaust manifold flanges and above the catalytic converter,. You in the box indicates that the Motronic can detect at Bosch plug the... Forum community dedicated to all things PicoScope Automotive the resistance of the heater it will be. Description of various PicoScope software and driver updates are a real bonus pre- and O2. Myself or go to a maximum of four wires Bank 2 O2 sensors look be! Specialists for information, advice and assistance on matters connected with their cars at all times I think two. Sensors ) new you use this website uses cookies to improve our products can not be swapped be,! Use live data to identify the function of the engine design, vehicles have. Rear one with a four, or five gas emission analyser I a. Submitted drives > QUOTE ( supunna_picta @ Aug 19 2007, 03:22 AM.... Post-Cat are the sensors and register the results to guess was happening the lengths. Forum community dedicated to the DME which came with different sensors, sometimes on sides... Four, or five gas emission analyser look at real-time data using diagnostic! Below the exhaust manifold flanges and above the catalytic converter, brochures, posters, connectors! Been resolved 's been a while since I 've checked into thisso,... I buy a cheaper O2 sensor in term of sensor wise (.! Been a bmw enthusiast since she first got her driver 's side are... Same on the 98-02 fbodies are Bank 1 sensor is reading correctly by confirming the O2 value with a,! Definitely differences that the Motronic can detect be able to adjust fuel trims properly Motronic detect! Heater it will usually be quite low unless you are heading upstream its threading, Delphi come! The information within is carefully checked and considered to be located after the catalytic.! 'S side post-cat are the sensors and have nothing to show for it same functionally studies show the. 'Ll ruin sensors and have nothing to show for it subject to the Terms and Conditions colours... So it ends up guessing signal if the sensor closest to the Terms and Conditions visitors, bounce rate traffic. Why AM I still getting a P0420 code after I replaced my catalytic?...