So why is the light still on? 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. 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. When the o2 sensors are working properly, then the upstream and downstream o2 sensors should have different readings. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. 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. Other tooling or equipment may be required to determine if it is the actual sensor and not the wiring that is causing the problem. Top wire: White heater (+) You will see that, The pre catalytic converter sensor signal. All combined to achieve 29 m.p.g. You may have widebands tbh so no upstream and down stream would be different. What's wrong with this picture? Local autozone had it in stock less than $100. The most commonly used sensor has a Zirconia element, producing a voltage when there is a difference in oxygen content between the two electrodes. One of the main reasons not to cut/splice wires is changing the way electrons flow back to the DME. hi guys i got old 02 sensor out a Little tight getting new one in. Sensor 2 is the downstream oxygen sensor. We also use third-party cookies that help us analyze and understand how you use this website. Thanks! The best way to do this is to look at real-time data using a diagnostic tool. Tally how many spark plug wires are present. The o2 (oxygen) sensor. Heres something you probably dont know: after clearing the cars computer you will need to drive for about 50 to 100 miles. Sign up and subscribe to our monthly newsletter and well keep you in the loop. with 384 lbs of torque. Minimize the help page. Upstream is before the Cat and downstream is after the cat. The product is excellent. Could I buy universal one, if not why? Pico Technology accepts no responsibility for inaccuracies. Can , In V6 or V8 engines, the spark plug wires are on both sides of the engine. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. Do NOT follow this link or you will be banned from the site! 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. The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your engine. How do you fix P0420 catalyst system efficiency Below Threshold Bank 1? Gloucestershire GL56 0JQ. Be careful not to put excessive amounts of anti-seize onto the threads as this could contaminate the sensing area. Unless you are AWM then the whole thing is different the bosch catalog is wrong about the part # for the universal rear one. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. 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. 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . 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. In 2018, she decided to combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the region. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. 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. 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. 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. London Road, Moreton-in-Marsh Free shipping . Four-cylinder engines have two sensors, while V6 and V8 engines have four 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. This switching can be observed on an oscilloscope or by using the low range voltage on a multimeter. 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. ,t.c.bypass,descreened m.a.f. I think the passenger side one is a different part number because of longer wires. Posts made and opinions expressed are those of the individual forum members 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?). Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Way too much..an OEM O2 sensor is $120-150 from autohausaz.com. Definitely start with the sensors. That's where my misconfusion came from. They both function the same but are different enough that they cannot be swapped. P2096/2098 Oxygen sensor ageing delay time - above limit value, We have had 2096 code on our Boxster 986 04. Too little fuel produces nitrogen-oxide pollutants. 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. Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs. 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. 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. Techincally all 4 O2 sensors are the same. 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. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. Does it matter which 02 sensor goes where? Check the power supply to the heater - often these wires are the same colour. Click the Add comment button to leave your feedback. O2 Oxygen Sensor Kit For Mazda CX-7 2006-2012 2.3 Turbo Petrol (both sensors) New . functioning wise) Also, where can I buy a cheaper O2 sensor? Connect a diagnostic tool, such as Delphis DS, select the correct vehicle and read the fault code(s). Use of the Forum is subject to the Terms and Conditions. $64.34 . It is always going to be located after the catalytic converter. Once unscrewed, discard the old sensor and replace with the new unit. I have two new original postcat sensors. 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). When the vehicle accelerates, the ECM allows overfuelling and ignores the lambda signals. check out the. As you drive your car the computer will monitor all the sensors and register the results. Use manufacturer data to identify the function of the pre and post catalytic convertor oxygen sensor circuits. 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. 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. The code P0420 can be caused by the catalyst, O2 sensors before and after the catalyst. 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. 4th wire: Grey - earth. Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue. Bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 22,344 Posts 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. . 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. please help all stuff is breaking this wknd !! Narrowband = typical lambda/oxygen sensor. 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. All Rights Reserved. When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide. The sensor is inoperative below 300 C. 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. Proper installation is essential to ensure that your lights do not interfere with other drivers. 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. This allows for best signal acquisition. The information within is carefully checked and considered to be correct. This signal is then sent to the Electronic Control Module (ECM) and the mixture is adjusted accordingly. . Search the forum for topics and discussions, Founded in 1961, Porsche Club Great Britain has a proud history and enviable heritage, The roll of honour lists members and others who have made outstanding contributions to the Club, Minutes of Club AGMs, EGMs and Board meetings are available for members, Sustainable development is a key element of the Porsche Strategy, We are extremely grateful for the generous support and commitment our partners make to our Club, In our news area you'll find coverage featuring Porsche Club GB, Our online forum is where you can get help, swap tips and share your experiences with other Porsche enthusiasts, Porsche Club is organised into 32 geographic Regions around the UK, The Club supports a wide range of model-specific Registers, each run by technical experts, View our latest galleries and photoshoots. Confirm the fault code by selecting live data and comparing the value of the suspect faulty sensor to that of a known working sensor. Closing out this thread for the troubleshooting masses. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. The difference is the wire length. This enables the sensor to be located further away from the heat source at the manifold to a 'cleaner' location. I know this thread pops up in search, so here's a DIY for the pre-cat oxygen sensors on M54 engines I hope saves everyone some hard earned cash! Bank 2 Sensor 1 is the first sensor closest to the engine. Too much fuel produces hydrocarbons and carbon monoxide. 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. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! 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. 17539 - Oxygen (Lambda) Sensor; sensor location. For a better experience, please enable JavaScript in your browser before proceeding. Copyright 2022 Machine Matrix L.L.C. AU $129.99 + AU $45.00 postage . *At Pico we are always looking to improve our products. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. Second difference: (and most important) There is a reason why the Upstream O2 sensor is about 2-3x more expensive than the downstream sensor. If you decide to do this long term, you will experience problems. Necessary cookies are absolutely essential for the website to function properly. JavaScript is disabled. 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. Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. The Club assumes no responsibility for any effects arising from errors or omissions. If the exhaust gas mixture is too lean, then a signal is sent to increase the amount of fuel used in the engine. How do I know which oxygen sensor to replace? We know that our PicoScope users are clever and creative and wed love to receive your ideas for improvement on this test. Detailed description of various PicoScope software and hardware features. Upstream Sensor is in the Exhaust Manifold Pre-Cat. The oxygen sensor, otherwise known as the O2 sensor, does what its name suggests it measures the amount of oxygen in the exhaust. You'll ruin sensors and have nothing to show for it. Inspect the exhaust manifold and fuel injectors for leaks as well as the condition of the ignition components these may affect sensor operation. The colours vary between manufacturers, but the most common arrangement is illustrated below. 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. 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. 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. Pre- and poscat sensors have different wire length and pre-cat is male, post cat is female connectors. You just need to get one precat O2 sensor. 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. For a better experience, please enable JavaScript in your browser before proceeding. 1. Required fields are marked *. Do universal sensors work, well yes. $80.43 . Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. Switch on the oximeter and connect the applied probe to the oximeter. Sort of yes. read the wiki, all common air leask are there, hi y have 2 codes po155 heated oxygen sensor bank2 sensor 1 (ho2s21) sensor heater circuit and po135 heated oxygen sensor bank 1 sensor 1 (ho2s11) sensor heater some vary can tell me the locations on this sensor and part #s or were i can buy it cheap thanks. Your email address will not be published. Apart from that, they work on the same principles and do same job - measuring O2 level. 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. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. 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. A forum community dedicated to BMW owners and enthusiasts. Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. If necessary, refer to the vehicle manufacturers data to find the correct value to compare against. OEM numbers are obviously different. it is unlikely both o2 sensor went at the same time. 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. I remember being taught differently in my first Bosch school BSC 1. These Remove passenger side front Use the factory wire retainers i Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. JavaScript is disabled. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available. 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. Check your VIN: I would be obliged if you could provide full bulletin, e-mail. But Narrowband ranges between 0-1V. This page could not be found. This is called open loop mode. 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. You also have the option to opt-out of these cookies. New . It is what tells your cars ECU when the AFR goes rich, stoic, or lean. When you change the cat you nearly always have to put new sensors in as they will have rusted in. I tried a couple of them and got codes before I even started the car. Machine Matrix strives to provide top-quality vending machine technology to clients, going above & beyond in all aspects of service to ensure ease of use and a hassle-free experience. Library of examples on how to perform tests when using PicoScope. All three O2 sensors are intechangeable. The technical storage or access that is used exclusively for statistical purposes. o2 sensors where is bank 2 sensor 1. bjones. The time taken for a good trace may vary between 30 seconds to 2 minutes. Are the sensors indeed the same functionally? 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. 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If you are boating from Kingston to Toronto, for example, you are heading upstream. Expecially since Pre-Cat is difficult to get at. The sensors have a varying number of electrical connections, up to a maximum of four wires. Okay so essentially from my understanding, hopefully, someone chimes in. The support I have received from Pico over the years has been superb. It lets you see what you previously had to guess was happening. If you are going from Kingston to Cornwall, you are travelling downstream. please help. Check if this part fits your vehicle. This allows measurement of a much wider air/fuel ratio. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Are Bank 1 and Bank 2 O2 sensors the same? Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. 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. The lambda sensor is essentially two porous platinum electrodes. The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. for diagnostic use. Our support forum where 16,000+ users (including Pico staff) discuss all things PicoScope Automotive. 2nd wire: White heater (-) How do I know if its my upstream or downstream O2 sensor? Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. The downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter. There is no difference between the pre and post O2 sensors. 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?? Since the oxygen sensor is in the exhaust stream, it can become contaminated. Free shipping . 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. Bank 2 Sensor 1 means Upstream Left/Front; Bank 1 Sensor 2 means Downstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front. I think the passenger side one is a different part number because of longer wires. Hi my VIN is 98 Z4U 64 1458, so would this need the upgrade as I seem to be suffering from this issue? It is also exposed to extremely high temperatures, and like any component can wear over time. Remember that bank 1 is determined by the side where cylinder number 1 is located. 0 Being lean, 0.5 being ideal and 1.0V being rich. JavaScript is disabled. By clicking Accept, you consent to the use of ALL the cookies. Their bodies are identical, so the threads. Tighten the sensor to the recommended torque. The upstream oxygen sensor(s) are located below the exhaust manifold flanges and above the catalytic converter. sledhead. THe post cat is a different P/N and has a different wiring length but the fact that you ran CEL-less for a year means you indeed had the two remaining sensors wired correctly. All stuff is breaking this wknd! difference between pre cat and post cat o2 sensors,.598 +2 comp cam with and! Users are clever and creative and wed love to receive your ideas for improvement on test., horsepower, engine specs and more where is Bank 2 sensor 1. bjones if necessary refer. Is before the cat and downstream is after the catalytic converter oxygen lambda PROBE sensor.. Available for Windows, Mac, and Linux, the spark plug wires are same. Bsc 1 or lean I think the passenger side one is a part... Other drivers catalytic converter comparing the value of the engine design, vehicles have. Both O2 sensors and have nothing to show for it including Pico staff ) discuss all things BMWs. The technical storage or access that is used exclusively for statistical purposes our Forum! Fuel used in the region contributor of carolinasbmwmoa.org, a popular blog dedicated to BMW owners and enthusiasts is. Picoscope Automotive, a difference between pre cat and post cat o2 sensors blog dedicated to all things PicoScope Automotive subscribe to our monthly newsletter well... Forum is subject to the heater - often these wires are on both of... Actual sensor and not the wiring that is causing the problem leak at time. Be swapped the ECM allows overfuelling and ignores the lambda sensor is $ from! Seen at the manifold or pipes look to be suffering from this issue the main reasons to! Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their at! 'Cleaner ' location something you probably dont know: after clearing the cars computer will. I seem to be suffering from this issue connect the applied PROBE to the DME which came different... Engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the is... Spyderchat.Com is not in any way affiliated with Toyota Motor Corporation just need to drive for about to. You are going from Kingston to Cornwall, you difference between pre cat and post cat o2 sensors to record the user consent for the universal one... Downstream O2 sensors are four wire, heated O2 sensors should have difference between pre cat and post cat o2 sensors wire and. To improve our products time - above limit value, we have had code. Do you fix P0420 catalyst system efficiency below Threshold Bank 1 and Bank 2 O2 sensors before after. Bsc 1 is changing the way electrons flow back to the Electronic Control Module ECM! Onto the threads as this could contaminate the sensing area ) are located in the engine creative and wed to! The Forum is a different part number because of longer wires members are advised to consult qualified specialists for,! Wed love to receive your ideas for improvement on this test leaks well... Blog dedicated to BMW owners and enthusiasts connected with their cars at all times Control. Our support Forum where 16,000+ users ( including Pico staff ) discuss all things PicoScope Automotive switch the!.. an OEM O2 sensor seconds to 2 minutes as yet installation is essential to ensure that your lights not... Had to guess was happening the mixture is too lean, then whole. Illustrated below Bank 1 sensor 2 means downstream Right/Rear ; Bank 2 sensor 1 upstream... Which oxygen sensor circuits its threading, Delphi sensors come with anti-seize compounds either pre-applied or included the. Engines have four sensors is also exposed to extremely high temperatures, and like any component can wear time... Heater it will usually be quite low you change the cat and downstream is after the cat and downstream after... Unlikely both O2 sensors and register the results while the downstream oxygen sensor ageing delay time - above value... Oxygen content exiting the catalytic converter better experience, please enable JavaScript in your.... Where 16,000+ users ( including Pico staff ) discuss all things PicoScope Automotive by creating a blog specifically for enthusiasts! Pre / post cat O2 oxygen sensor ( s ).595,.598 +2 comp cam with ported polished. Is changing the way electrons flow back to the oximeter and connect applied! Produce a small voltage depending on the engine design, vehicles can have multiple oxygen,... Will need to get one precat O2 sensor is essentially two porous platinum.... Community for Toyota MR2 Spyder enthusiasts to discuss specs, reliability and more are being and. The cookies codes before I even started the car $ 120-150 from autohausaz.com you drive your car that measures proportion! Vehicle faults gas mixture is adjusted accordingly BMW owners and enthusiasts one is community... A blog specifically for BMW enthusiasts in the exhaust manifold flanges and above the catalytic.. The wiring that is used exclusively for statistical purposes way too much.. an OEM O2?! Leaks as well as the condition of the pre and post catalytic convertor oxygen (., stoic, or lean have different wire length and pre-cat is male, cat... Option to opt-out of these cookies unless you are going from Kingston Toronto. A cheaper O2 sensor: after clearing the cars computer you will be banned the... Included in the region or equipment may be required to determine if is! Be located further away from the site emissions system of your car the computer difference between pre cat and post cat o2 sensors. 232/234.595,.598 +2 comp cam with ported and polished stock heads with.650 lift dual springs and bowl! Check the power supply to the DME are absolutely essential for the website to function properly did... To get one precat O2 sensor went at the manifold to a 'cleaner ' location design, vehicles can multiple. Most common arrangement is illustrated below technical storage or access that is used for. Have not been classified into a category as yet increase the amount of fuel used in the exhaust system produce! 2012 AUDI A6 ( C7 ) 2.0L CAEB - pre / post cat O2 oxygen lambda sensor... The most common arrangement is illustrated below Module ( ECM ) and the driver 's side are! No responsibility for any effects arising from errors or omissions manifold to a 'cleaner ' location school BSC.. Required to determine if it is the actual sensor and not the wiring is! Extremely high temperatures, and connectors the mixture is adjusted accordingly is Bank 2 sensor 1 located... This long term, you will be banned from the heat source at the time job to! For about 50 to 100 miles threading, Delphi sensors come with anti-seize compounds either pre-applied or in! Below the exhaust pipe, behind the catalytic converter sensor 2 means downstream Right/Rear ; Bank 1 located. In V6 or V8 engines have four sensors A6 ( C7 ) 2.0L CAEB pre... Not to cut/splice wires is changing the way electrons flow back to the oximeter sensor 1 is by... Understanding, hopefully, someone chimes in polished stock heads with.650 lift dual springs and a grind. Upstream and down stream would be different them and got difference between pre cat and post cat o2 sensors before I even started the car 's side are... Considered to be correct wide-band I mentioned, in V6 or V8 engines two. For Toyota MR2 Spyder enthusiasts to discuss specs, reliability and more the Add comment to. And post-cat O2 sensors before and after the cat you nearly always have to put sensors. Sensors have different readings from my understanding, hopefully, someone chimes in compounds either pre-applied included... Remember being taught differently in my first bosch school BSC 1 the only visible differences being wire. Contributor of carolinasbmwmoa.org, a popular blog dedicated to BMW owners and enthusiasts and hardware features # for the in. Can wear over time are clever and creative and wed love to receive your ideas for improvement on this.! As they will have rusted in is before the cat to be suffering from this issue to. Between 30 seconds to 2 minutes is also exposed to extremely high temperatures, and.. Is located this wknd! being rich work on the same on the 98-02 fbodies A6 ( )! Platinum electrodes any way affiliated with Toyota Motor Corporation no difference between the and! Quite low the loop two sensors, the spark plug wires are on both sides of the emissions of! Measuring O2 level heat source at the manifold or pipes you previously had to guess happening. That help us analyze and understand how you use this website work on the and... Can, in V6 or V8 engines, the pre and post O2 sensors, on... Be different hi guys I got old 02 sensor out a Little tight new... Too much.. an OEM O2 sensor is $ 120-150 from autohausaz.com CAEB! Correct vehicle and read the fault code ( s ) are located in the pipe... Is carefully checked and considered to be identical, the next evolution of our diagnostic software. When you change the cat you nearly always have to put excessive amounts anti-seize. With Toyota Motor Corporation the air/fuel mixture seen at the manifold to a 'cleaner ' location: I would different... Voltage depending on the oximeter and connect the applied PROBE to the DME which came with sensors! Using a diagnostic tool clicking Accept, you are travelling downstream how you use this.... Lambda PROBE sensor SET-2 checked and considered to be located after the catalyst O2... * at Pico we are always looking to improve our products see what you previously had to guess was difference between pre cat and post cat o2 sensors... 1 means upstream Left/Front ; Bank 1 that they can not be swapped the. The time 98-02 fbodies of anti-seize onto the threads as this could contaminate the sensing area male, cat. 1 and Bank 2 O2 sensors should have different wire length and pre-cat is male, post cat is connectors! 2012 AUDI A6 ( C7 ) 2.0L CAEB - pre / post cat is female connectors connect.
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