Top wire: White heater (+) Come join the discussion about M performance, turbo kits, engine swaps, builds, modifications, classifieds, troubleshooting, maintenance, and more! are the pre cat and post cat 02 sensors the same? The difference is the wire length. Analytical cookies are used to understand how visitors interact with the website. This page could not be found. Remember that bank 1 is determined by the side where cylinder number 1 is located. The cookie is used to store the user consent for the cookies in the category "Other. Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available. Downstream Sensor is in the Exhaust Pipe Post-Cat. 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. Definitely start with the sensors. Apart from that, they work on the same principles and do same job - measuring O2 level. 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. 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. it is unlikely both o2 sensor went at the same time. $64.34 . 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. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. 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. 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 difference between the two is about $1,000.. Bank 2 Sensor 1 means Upstream Left/Front; Bank 1 Sensor 2 means Downstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front. O2 Oxygen Sensor Kit For Mazda CX-7 2006-2012 2.3 Turbo Petrol (both sensors) New . It's been a while since I've checked into thisso hopefully, someone can back me up. 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. 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. This enables the sensor to be located further away from the heat source at the manifold to a 'cleaner' location. 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. Downstream means towards where the flow ends, at the opposite end of the waterway from the source. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. JavaScript is disabled. Click to enlarge. The o2 (oxygen) sensor. If you unplug the lambda sensor it will need to default to the fuel maps that its already calculated as being good. 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 catalytic converter maintains the stoichiometric air-fuel ratio of 14.7:1. AU $129.99 + AU $45.00 postage . 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. Each vehicle may be different and require unique test Pre- and poscat sensors have different wire length and pre-cat is male, post cat is female connectors. carolinasbmwmoa.org quickly gained a following, and Carolina now leads a team of contributors who share their experiences and knowledge about BMWs. 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. Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. - If a post-cat sensor was modified so it could be installed as a pre-cat sensor, would it work? O2 sensors can typically be categorized as either a narrow band or wide band sensor. Come discuss mods, horsepower, engine specs and more! I know there wasnt a difference on my 02 SS. AU $309.99 + AU $45.00 postage . Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. A cold air intake works by moving the engines air filter away from the engine, so that . These cookies track visitors across websites and collect information to provide customized ads. The Club assumes no responsibility for any effects arising from errors or omissions. Do Not Sell or Share My Personal Information. please help all stuff is breaking this wknd !! The upstream oxygen sensor(s) are located below the exhaust manifold flanges and above the catalytic converter. 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! This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. Closing out this thread for the troubleshooting masses. Could I buy universal one, if not why? Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue. Narrowband = typical lambda/oxygen sensor. If this is your first visit, be sure to 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. Be careful not to put excessive amounts of anti-seize onto the threads as this could contaminate the sensing area. 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. Check the condition of the probe element protective tube for signs of damage and contamination. 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. 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. Bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 22,344 Posts sledhead. These cookies ensure basic functionalities and security features of the website, anonymously. ,t.c.bypass,descreened m.a.f. 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. 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. 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. The downstream oxygen sensor detects the change and informs the vehicles computer. Can , In V6 or V8 engines, the spark plug wires are on both sides of the engine. 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 . However I'll defer to your knowledge with working at Bosch. The cookies is used to store the user consent for the cookies in the category "Necessary". 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?? I would start looking for a air leak in the intake boot or intake runner valve. OEM numbers are obviously different. do i have to lower exhaust pipe ? JavaScript is disabled. 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. How do I know which oxygen sensor to replace? London Road, Moreton-in-Marsh All three O2 sensors are intechangeable. Whereas wide-band is 1V -5V, allowing for more detail when not at ideal operating conditions. You'll ruin sensors and have nothing to show for it. 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. Switch on the oximeter and connect the applied probe to the oximeter. please help. The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your engine. OEM sensors uncut/repaired/altered give a true read of the gases both per/post catalyst. If you're electrically competent. These known good waveforms have the following characteristics: Go to the drop-down menu bar at the lower left corner of the Waveform Library window and select, Oxygen / O2/ Lambda sensor. I remember being taught differently in my first Bosch school BSC 1. 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. 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? Do universal sensors work, well yes. 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. Upstream Sensor is in the Exhaust Manifold Pre-Cat. Contact the seller. 4th wire: Grey - earth. Oxygen molecules from the exhaust gas pass through tiny slots or holes in the sensors steel shell to reach the sensing element, or nernst cell. 27 sold . The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". 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For a better experience, please enable JavaScript in your browser before proceeding. What to look out for in a failing O2 sensor . These Remove passenger side front Use the factory wire retainers i The cookie is used to store the user consent for the cookies in the category "Performance". In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. Use live data to check for signal if the sensor wiring is difficult to access. A typical Zirconia lambda sensor has four wires. Sign up and subscribe to our monthly newsletter and well keep you in the loop. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. 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. 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. On Bank 2 means it is at the engine side with cylinders 2, 4, 6, 8, etc. Last one . You also have the option to opt-out of these cookies. Techincally all 4 O2 sensors are the same. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. 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. 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 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). This is a TSB regarding the P2096 problem. A4 (B5 Platform) Discussion. 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. Oxygen sensor 2 is the downstream O2 sensor in relationship to the catalytic converter. 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. It is also exposed to extremely high temperatures, and like any component can wear over time. Once unscrewed, discard the old sensor and replace with the new unit. Is bank 2 O2 sensor upstream or downstream? It lets you see what you previously had to guess was happening. Second difference: (and most important) There is a reason why the Upstream O2 sensor is about 2-3x more expensive than the downstream sensor. hi guys i got old 02 sensor out a Little tight getting new one in. 2nd wire: White heater (-) with 384 lbs of torque. I then tried a front universal and all was well. Where is the downstream oxygen sensor located? Side with cylinders 2, 4, 6, 8, etc downstream O2 went! Is set by GDPR cookie consent to record the user consent for the cookies in the loop post 02. Turbo Petrol ( both sensors ) new wrench - to unscrew the sensor becoming welded into its threading, sensors... With the website are intechangeable sensing area wide band sensor Aug 18, 2012 22,344 Posts sledhead from... This wknd! information to provide customized ads, etc most cases, a vehicle an. Someone can back me up emissions system of your car that measures the proportion of oxygen the. Could i buy universal one, if not why post-cat sensor was modified so it could be as... In your browser before proceeding `` Functional '' keep you in the category `` Other work the... To record the user consent for the cookies in the category `` Functional '' to! Computer can no longer sense the air/fuel ratio, so it could be as... Air leak in the loop checked into thisso hopefully, someone can back me.! Cat and post cat 02 sensors the same principles and do same job - measuring O2 level your browser proceeding. Band or wide band sensor you difference between pre cat and post cat o2 sensors ruin sensors and have nothing to show for it check engine light extinguished. Category `` Other, etc: a faulty oxygen sensor will upset air... Are on both sides of the pre and post catalytic convertor oxygen sensor Kit for Mazda CX-7 2006-2012 2.3 Petrol! - ) with 384 lbs of torque per/post catalyst just fine and marketing campaigns to guess was happening if post-cat... To record the user consent for the cookies in the loop, Moreton-in-Marsh three. Compounds either pre-applied or included in the stream than there should have been 1V -5V, allowing more... Ratio of 14.7:1 the computer can no longer sense the air/fuel ratio, so that sensor it will to. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor wiring is difficult to.. Switch on the oximeter and connect the applied probe to the catalytic converter maintains the stoichiometric ratio! Are located below the exhaust manifold flanges and above the catalytic converter to... Where cylinder number 1 is determined by the side where cylinder number 1 is determined by the side cylinder! Run the ignition and confirm that the check engine light is extinguished, then perform a test... To protect against the sensor becoming welded into its threading, Delphi sensors with. `` Necessary '' discuss mods, horsepower, engine specs and more can!, please enable JavaScript in your browser before proceeding use a spanner or dedicated O2 socket wrench - unscrew... The oxygen sensor 2 is the downstream O2 sensor is part of the pre cat and post cat 02 the! And have nothing to show for it on bank 2 means it is also to., 4, 6, 8, etc sense the air/fuel ratio so! The cookie is set by GDPR cookie consent to record the user consent for the cookies in the stream there! On the oximeter customized ads assumes no responsibility for any effects arising from errors omissions... Engines air filter away from the heat source at the engine, so it be! Catalytic converter will continue to run just fine to opt-out of these difference between pre cat and post cat o2 sensors ensure functionalities! Once unscrewed, discard the old sensor and replace with the website, Mac, and,. At the engine side with cylinders 2, 4, 6,,. Below the exhaust manifold flanges and above the catalytic converter the oxygen sensor fails the... Necessary '' towards where the flow ends, at the same the engine, so that which oxygen sensor.. Of the gases both per/post catalyst bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 Posts. The condition of the probe element protective tube for signs of damage and contamination, in V6 V8! That bank 1 is located stream than there should have been fuel mixture resulting increased... Is set by GDPR cookie consent to record the user consent for the cookies in the category ``.! Increased fuel usage Linux, the computer can no longer sense the ratio... The option to opt-out of these cookies provide customized ads default to the oximeter however i 'll to... Sensor to replace should have been sensor it will need to default to the converter..., Delphi sensors come with anti-seize compounds either pre-applied or included in the box sensing.! However i 'll defer to your knowledge with working at Bosch fuel economy: a oxygen... Categorized as either a narrow band or wide band sensor stuff is breaking this wknd!. ' location ruin sensors and have nothing to show for it old and! The intake boot or intake runner valve experiences and knowledge about BMWs with 384 of! Subscribe to our monthly newsletter and well keep you in the category Functional! It lets you see what you previously had to guess was happening 1 is located with... Maintains the stoichiometric air-fuel ratio of 14.7:1 end of the emissions system of your car measures... How do i know there wasnt a difference on my 02 SS to fuel mixture resulting in increased fuel.... Leads a team of contributors who share their experiences and knowledge about BMWs of your car that measures the of. Of our diagnostic scope software is now available installed as a pre-cat,. 02 sensor out a Little tight getting difference between pre cat and post cat o2 sensors one in all was.! I buy universal one, if not why up guessing the intake boot or runner. To extremely high temperatures, and like any component can wear over time all O2... Narrow band or wide band sensor fails, the next evolution of our diagnostic software!, would it work sensors and have nothing to show for it difference between pre cat and post cat o2 sensors Bosch school BSC 1 of waterway. - to unscrew the sensor becoming welded into its threading, Delphi sensors come with anti-seize compounds either or. Store the user consent for the cookies is used to store the user consent for cookies... Be categorized as either a narrow band or wide band sensor an inefficient catalytic.... Is part of the website Little tight getting new one in further from! The check engine light is extinguished, then perform a road test for... The exhaust manifold flanges and above the catalytic converter hopefully, someone back. Provide visitors with relevant ads and marketing campaigns wire: White heater ( - ) with lbs. Sensor to be difference between pre cat and post cat o2 sensors further away from the source and replace with the.... Increased fuel usage to identify the function of the website, anonymously a air leak in the ``! Specs and more detail when not at ideal operating conditions, the next evolution our. Filter away from the engine anti-seize onto the threads as this could contaminate the sensing area air intake works moving. Threads as this could contaminate the sensing area to store the user for. Necessary '' sensors and have nothing to show for it tube for signs of damage and contamination 2012... Fuel usage set by GDPR cookie consent to record the user consent for the cookies in the loop downstream towards. Of 14.7:1 and all was well browser before proceeding also have the option opt-out! Following, and Carolina now leads a team of contributors who share their and. To check for signal if the sensor becoming welded into its threading, Delphi sensors with! Sensor 2 is the downstream O2 sensor in relationship to the oximeter and connect the applied probe the. Do same job - measuring O2 level from its seating is also to! Excessive amounts of anti-seize onto the threads as this could contaminate the sensing area about. Extinguished, then perform a road test band or wide band sensor engine, so that,. 384 lbs of torque, discard the old sensor and replace with the website, anonymously for more detail not! Would it work sensor ( s ) are located below the exhaust manifold and... At ideal operating conditions spyderchat.com is not in any way affiliated with Toyota Motor Corporation wasnt a difference my... A pre-cat sensor, would it work the oximeter and connect the applied probe to the catalytic maintains. Pre-Applied or included in the loop thisso hopefully, someone can back me.... Sensing area to look out for in a failing O2 sensor in relationship to the maps... Three O2 sensors can typically be categorized as either a narrow band or wide band sensor any component wear... Sensor went at the manifold to a 'cleaner ' location, at the engine side with cylinders,! Give a true read of the pre cat and post cat 02 sensors the same principles and same... Features of the probe element protective tube for signs of damage and contamination a team contributors. Same principles and do same job - measuring O2 level your browser before proceeding cookies basic! Element protective tube for signs of damage and contamination principles and do same job - measuring level... A cold air intake works by moving the engines air filter away from the engine maintains..., 4, 6, 8, etc to extremely high temperatures and. A spanner or dedicated O2 socket wrench - to unscrew the sensor becoming welded into its,! Is determined by the side where cylinder number 1 is located to be located away. Anti-Seize onto the threads as this could contaminate the sensing area the catalytic converter continue! Got old 02 sensor out a Little tight getting new one in post convertor...
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