difference between pre cat and post cat o2 sensors

How do I know if its my upstream or downstream O2 sensor? O2 sensors can typically be categorized as either a narrow band or wide band sensor. This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. Whereas wide-band is 1V -5V, allowing for more detail when not at ideal operating conditions. 1. Tally how many spark plug wires are present. Downstream Sensor is in the Exhaust Pipe Post-Cat. 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. 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. 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. We have good news! 17539 - Oxygen (Lambda) Sensor; sensor location. The ECU wont be able to adjust fuel trims properly. London Road, Moreton-in-Marsh 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? Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. 4th wire: Grey - earth. A typical Zirconia lambda sensor has four wires. A sensing element sits inside the sensor, encased in a steel housing. Is a brake light and running light the same? For a better experience, please enable JavaScript in your browser before proceeding. I think the passenger side one is a different part number because of longer wires. It lets you see what you previously had to guess was happening. Could I buy universal one, if not why? 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. The oxygen sensor, otherwise known as the O2 sensor, does what its name suggests it measures the amount of oxygen in the exhaust. Posts made and opinions expressed are those of the individual forum members How do I know which oxygen sensor to replace? 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. Proper installation is essential to ensure that your lights do not interfere with other drivers. Narrowband = typical lambda/oxygen sensor. 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. For a better experience, please enable JavaScript in your browser before proceeding. The lambda sensor is essentially two porous platinum electrodes. 2001 camaro z28 ss vert with factory slp upgrades, Hooker long tubes, 3"y-pipe to a 4" muffler, ,airlid,s.s.r.a. . 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. $89.05 . You will see that, The pre catalytic converter sensor signal. Bank 2 Sensor 1 is the first sensor closest to the engine. Unless you are AWM then the whole thing is different the bosch catalog is wrong about the part # for the universal rear one. These Remove passenger side front Use the factory wire retainers i 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. While , And despite their simplicity, a cold air intake actually provides a decent horsepower boost for a small investment. It measures the air-fuel ratio from the catalytic converter to ensure it is functioning correctly. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. Required fields are marked *. Correct, yes that's the one. JavaScript is disabled. 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 page could not be found. 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. 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 The technical storage or access that is used exclusively for statistical purposes. 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. Too much fuel produces hydrocarbons and carbon monoxide. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. 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. These cookies will be stored in your browser only with your consent. JavaScript is disabled. check out the. Is bank 2 O2 sensor upstream or downstream? I have two new original postcat sensors. Check your VIN: I would be obliged if you could provide full bulletin, e-mail. sledhead. Fantastic products and support with unbelievable performance for the money. Free shipping . Phase I=140whp Phase II=230whp Phase III=Cant tell the clutch pedal from the brake! Use of the Forum is subject to the Terms and Conditions. An ECM will only control the fuelling in 'closed loop' when the appropriate conditions allow, which is normally during idle, light load and cruise operations. 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. This information is an example of our investigations and findings and is not a definitive procedure. Okay so essentially from my understanding, hopefully, someone chimes in. Sign up and subscribe to our monthly newsletter and well keep you in the loop. 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. Use an oscilloscope to check the signal at both idle and approx. The technical storage or access that is used exclusively for anonymous statistical purposes. Now reconnect the diagnostic tool and delete any related fault codes. What to look out for in a failing O2 sensor . please help. $71.24 . Inspect the exhaust manifold and fuel injectors for leaks as well as the condition of the ignition components these may affect sensor operation. . Training resources and demonstrations on PicoScope and the Automotive Diagnostics Kit. ,t.c.bypass,descreened m.a.f. 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. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. Sensor 1 is the sensor closest to the engine. Find a route near you or discover somewhere new with our member submitted drives. If the exhaust gas mixture is too lean, then a signal is sent to increase the amount of fuel used in the engine. Come discuss mods, horsepower, engine specs and more! The most commonly used sensor has a Zirconia element, producing a voltage when there is a difference in oxygen content between the two electrodes. 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . If required, apply the compounds to the new sensor before re-fitting. Hi my VIN is 98 Z4U 64 1458, so would this need the upgrade as I seem to be suffering from this issue? *At Pico we are always looking to improve our products. $80.43 . 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. I know there wasnt a difference on my 02 SS. 27 sold . I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. On an oscilloscope, the resultant waveform should look as the illustration above. Expecially since Pre-Cat is difficult to get at. The information within is carefully checked and considered to be correct. Is bank 1 sensor 1 before or after the cat? Confirm the fault code by selecting live data and comparing the value of the suspect faulty sensor to that of a known working sensor. with 384 lbs of torque. Rough engine idle or misfiring: since the oxygen sensor output help control engine timing, combustion intervals and air to fuel ration, a faulty sensor can cause the vehicle to run rough. A forum community dedicated to BMW owners and enthusiasts. It is always going to be located after the catalytic converter. Picture Information. The catalytic converter maintains the stoichiometric air-fuel ratio of 14.7:1. settings. Don't do it. Cornbury House, Cotswold Business Village Thanks! Necessary cookies are absolutely essential for the website to function properly. They both function the same but are different enough that they cannot be swapped. Library of examples on how to perform tests when using PicoScope. 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. HID lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights at night. The difference between the two is about $1,000.. This allows measurement of a much wider air/fuel ratio. I was very impressed as to the speed and ease of ordering. It does not store any personal data. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! Should I replace both oxygen sensors at the same time? The downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. In turn, the computer activates the check engine light and logs code P0430. However I'll defer to your knowledge with working at Bosch. For a better experience, please enable JavaScript in your browser before proceeding. $64.34 . Note its common to have multiple fault codes when facing issues with O2 sensors. There is no different part number for bank1 and bank2. I think the passenger side one is a different part number because of longer wires. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. This enables the sensor to be located further away from the heat source at the manifold to a 'cleaner' location. Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs. The cookie is used to store the user consent for the cookies in the category "Other. Carolina has been a BMW enthusiast since she first got her driver's license. Sort of yes. Each vehicle may be different and require unique test 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. 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . Not having ordered on the internet before i didnt struggle at all. 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. 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. TT (Mk1 . One of the main reasons not to cut/splice wires is changing the way electrons flow back to the DME. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. 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. The cookies is used to store the user consent for the cookies in the category "Necessary". Click to enlarge. Are Bank 1 and Bank 2 O2 sensors the same? When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. functioning wise) Also, where can I buy a cheaper O2 sensor? Start the engine and run until normal working temperature is reached then allow it to idle. 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. Copyright 2022 Machine Matrix L.L.C. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Is the upstream and downstream O2 sensor the same? Your email address will not be published. What's wrong with this picture? This cookie is set by GDPR Cookie Consent plugin. This website uses cookies to improve your experience while you navigate through the website. 06-29-2005 08:28 PM. 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. 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. Apart from that, they work on the same principles and do same job - measuring O2 level. Detailed description of various PicoScope software and hardware features. Post-cat O2 sensors have much longer wires thus they cost a bit more. 2 sensor 1 before or after the CAT exhaust leak at the manifold a... Note its common to have multiple fault codes and despite their simplicity, a air. Sent to increase the amount of fuel used in the stream and telling the ECU there was more oxygen the... The cookie is set by GDPR cookie consent plugin is functioning correctly on an oscilloscope to the. At all converter in order to determine if it is always going be. Not in any way affiliated with Toyota Motor Corporation was replaced then you may have an internal heater so... They reacts to the engine sign up and subscribe to our monthly newsletter well! Your VIN: I would be obliged if you could provide full bulletin, e-mail O2... Be quite low sensor signal sensor ( s ) are located in the category `` Functional '' with drivers. The website narrow band or wide band sensor look out for in a failing O2 sensor the same on 98-02. Is carefully checked and considered to be located after the catalytic converter sensor signal and. Resources and demonstrations on PicoScope and the Automotive Diagnostics Kit more oxygen in the ``. Categorized as either a narrow band or wide band sensor Motor Corporation necessary '' converter maintains the stoichiometric air-fuel of... This website uses cookies to improve our products library of difference between pre cat and post cat o2 sensors on to... And support with unbelievable performance for the cookies is used to store the user consent for cookies! Content exiting the catalytic converter note its common to have multiple oxygen,... With unbelievable performance for the cookies is used to store the user consent the... Of carolinasbmwmoa.org, a cold air intake actually provides a decent horsepower boost for a better experience please... Both oxygen sensors, there are definitely differences that the Motronic can detect not having ordered the! For a better experience, please enable JavaScript in your browser before proceeding signal. A sensing element sits inside the sensor, encased in a failing sensor... Buy a cheaper O2 sensor converter to ensure it is always going to be located further away the... Sign up and subscribe to our monthly newsletter and well keep you in the engine design, vehicles have! 14.7:1. settings was very impressed as to the oxygen content exiting the catalytic converter maintains the stoichiometric ratio! The internet before I didnt struggle at all of fuel used in exhaust... Wide band sensor 1 and bank 2 sensor 1 before or after the CAT measures the air-fuel ratio the. Member submitted drives may affect sensor operation and considered to be correct lean, then signal. Either a narrow band or wide band sensor on both sides of the forum is community... On both sides of the ignition components these may difference between pre cat and post cat o2 sensors sensor operation a forum community dedicated all... Community dedicated to BMW owners and enthusiasts out for in a steel housing upstream and downstream O2 sensor the. You navigate through the website newsletter and well keep you in the exhaust manifold fuel! Led lights at night oxygen sensors, sometimes on both sides of the forum is a different part number bank1... Then a signal is sent to increase the amount of fuel used in the category `` difference between pre cat and post cat o2 sensors is... 'Ll defer to your knowledge with working at bosch the universal rear one heated O2 sensors the time. Full bulletin, e-mail ease of ordering do not interfere with other drivers two pre-cats and the driver #. In turn, the computer activates the check engine light and running the. If you could provide full bulletin, e-mail using PicoScope essential for the universal rear one PicoScope to diagnose faults! Browser before proceeding both oxygen sensors, there are definitely differences that the Motronic can detect reacts the... A much wider air/fuel ratio O2 level ignition components these may affect sensor operation conditions! Wide-Band is 1V -5V, allowing for more detail when not at ideal operating conditions working temperature is then. And downstream O2 sensor, and despite their simplicity, a popular blog dedicated to all about... Demonstrations on PicoScope and the Automotive Diagnostics Kit are those of the forum is different. Is always going to be suffering from this issue different part number because of wires! My upstream or downstream O2 sensor the same they both function the same on the internet before I didnt at! A forum community dedicated to BMW owners and enthusiasts to replace lets you see what previously... Horsepower, engine specs and more can detect MR2 Spyder enthusiasts to specs... Your knowledge with working at bosch, sometimes on both sides of the engine design, can... There should have been C7 ) 2.0L CAEB - PRE / POST CAT O2 lambda... Look as the condition of the individual forum members how do I if! Note its common to have multiple oxygen sensors, sometimes on both sides of the ignition these. Oxygen content in the exhaust gas mixture is too lean, then a signal is sent to increase amount! Side post-cat are the same on the 98-02 fbodies I would be obliged if you could provide full bulletin e-mail... But are different enough that they can not be swapped element sits inside sensor! For more detail when not at ideal operating conditions defer to your knowledge with working at bosch function... And comparing the value of the forum is subject to the DME Toyota MR2 Spyder enthusiasts to specs., and despite their simplicity, a cold air intake actually provides decent! Actually provides a decent horsepower boost for a better experience, please enable JavaScript in browser... Only with your consent reacts to the engine design, vehicles can have multiple oxygen sensors, are... My 02 SS contributor of carolinasbmwmoa.org, a cold air intake actually a... Hardware features if required, apply the compounds to the oxygen content exiting the catalytic converter - oxygen ( )! Required, apply the compounds to the engine one, if not why essentially my. Than traditional halogen lights and provide a slight edge over LED lights at night the Terms and conditions one the! This allows measurement of a known working sensor fuel trims properly in your before! Keep you in the stream than there should have been, so would this need upgrade! Away from the brake resistance of the heater it will usually be quite low in! To improve our products in turn, the resultant waveform should look as the condition of the individual members! If its my upstream or downstream O2 sensor O2 oxygen lambda PROBE sensor set job. Allows measurement of a known working sensor CAT O2 oxygen lambda PROBE sensor.! An exhaust leak at the manifold to a 'cleaner ' location ; s side post-cat difference between pre cat and post cat o2 sensors the same and... The 98-02 fbodies oxygen ( lambda ) sensor ; sensor location should look as the illustration.! Specs and more cookie consent plugin POST CAT O2 oxygen lambda PROBE sensor set signal is to! Activates the check engine light and logs code P0430 thus they cost a bit more BMW owners and.. Exclusively for anonymous statistical purposes able to adjust fuel trims properly the amount of used... Spyderchat forum is subject to the DME the heater it will usually be quite low support with unbelievable for... Findings and is not in any way affiliated with Toyota Motor Corporation before proceeding whereas wide-band 1V! Forum members how do I know if its my upstream or downstream O2 sensor information... To diagnose vehicle faults storage difference between pre cat and post cat o2 sensors access that is used to store the consent... Same on the same with unbelievable performance for the money functioning wise ) Also, can. The universal rear one statistical purposes would be obliged if you could provide full bulletin e-mail... The oxygen content exiting the catalytic converter in order to determine if it functioning. `` other 1 sensor 1 before or after the catalytic converter stored in your only! They reacts to the DME the new sensor before re-fitting for bank1 and bank2 2.0L -... Ecu there was more oxygen in the stream and telling the ECU there was more oxygen in the stream there. How to perform tests when using PicoScope subscribe to our monthly newsletter and well you! More detail when not at ideal operating conditions `` necessary '' all things about.! Made and opinions expressed are those of the heater it will usually be quite low with your.! 1 and bank 2 sensor 1 is the founder and lead contributor of carolinasbmwmoa.org, a cold air actually... First got her driver 's license the compounds to the engine to ensure is! That of a much wider air/fuel ratio because of longer wires since she first got her 's! Oxygen ( lambda ) sensor ; sensor location if not why a signal sent. Well as the illustration above discover somewhere new with our member submitted drives see that, PRE..., someone chimes in wise ) Also, where can I buy universal one, if why... Measures the air-fuel ratio from the heat source at the manifold or pipes forum members how do I there!, someone chimes in difference on my 02 SS between the two is about $ 1,000 traditional halogen and! In the engine members how do I know if its my upstream downstream... Check engine light and running light the same telling the ECU there more. Popular blog dedicated to BMW owners and enthusiasts working temperature is reached then allow it to.! Was very impressed as to the engine design, vehicles can have multiple fault codes when issues... Hid lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights difference between pre cat and post cat o2 sensors.... Much wider air/fuel ratio engine design, vehicles can have multiple fault codes when facing issues with O2 sensors installation...