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?? Local autozone had it in stock less than $100. Other tooling or equipment may be required to determine if it is the actual sensor and not the wiring that is causing the problem. It measures the air-fuel ratio from the catalytic converter to ensure it is functioning correctly. $89.05 . Do NOT follow this link or you will be banned from the site! The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. Check the O2 sensor is reading correctly by confirming the O2 value with a four, or five gas emission analyser. O2 Sensor Location. 06-29-2005 08:28 PM. Heres something you probably dont know: after clearing the cars computer you will need to drive for about 50 to 100 miles. Use live data to check for signal if the sensor wiring is difficult to access. The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. If they have the same reading, then it indicates that the catalytic converter is damaged. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. Where as before 2003, they were like yours using all 4 regular. The "pre-cat sensor" regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. 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. 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. How do I know which oxygen sensor to replace? Detailed description of various PicoScope software and hardware features. Your email address will not be published. 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . If you're electrically competent. You just need to get one precat O2 sensor. functioning wise) Also, where can I buy a cheaper O2 sensor? The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. 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. Our collection of training videos, articles, guides and information on training courses. But Narrowband ranges between 0-1V. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. 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. Thanks! These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The technical storage or access that is used exclusively for anonymous statistical purposes. Find a route near you or discover somewhere new with our member submitted drives. If you are boating from Kingston to Toronto, for example, you are heading upstream. Their bodies are identical, so the threads. 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. Could I buy universal one, if not why? The information within is carefully checked and considered to be correct. Okay so essentially from my understanding, hopefully, someone chimes in. Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. Since the oxygen sensor is in the exhaust stream, it can become contaminated. It lets you see what you previously had to guess was happening. I know there wasnt a difference on my 02 SS. 17539 - Oxygen (Lambda) Sensor; sensor location. Once unscrewed, discard the old sensor and replace with the new unit. There is no difference between the pre and post O2 sensors. Contact information for direct sales and support queries, plus our network of global distributors. Contact the seller. Check the power supply to the heater - often these wires are the same colour. O2 sensors can typically be categorized as either a narrow band or wide band sensor. 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. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. 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. Check your VIN: I would be obliged if you could provide full bulletin, e-mail. It's been a while since I've checked into thisso hopefully, someone can back me up. Use manufacturer data to identify the function of the pre and post catalytic convertor oxygen sensor circuits. What's wrong with this picture? 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). The difference is the wire length. 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. So why is the light still on? The regular software and driver updates are a real bonus. The technical storage or access that is used exclusively for statistical purposes. It's been a while since I've checked into this.so hopefully, someone can back me up. Other than the connector, is there a difference? This cookie is set by GDPR Cookie Consent plugin. Check the condition of the probe element protective tube for signs of damage and contamination. Sort of yes. The sensor signal helps keep the mixture just right. The code P0420 can be caused by the catalyst, O2 sensors before and after the catalyst. 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. You never never never get anything done at the dealer, NEVERRRRRR. Click the Add comment button to leave your feedback. Click to enlarge. 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. 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. It is what tells your cars ECU when the AFR goes rich, stoic, or lean. please help. Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. If this is your first visit, be sure to carolinasbmwmoa.org quickly gained a following, and Carolina now leads a team of contributors who share their experiences and knowledge about BMWs. 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. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! Techincally all 4 O2 sensors are the same. 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. I then tried a front universal and all was well. 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 downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter. Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue. 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . Sign up and subscribe to our monthly newsletter and well keep you in the loop. hi guys i got old 02 sensor out a Little tight getting new one in. Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. 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. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. Disclaimer Switch on the oximeter and connect the applied probe to the oximeter. In 2018, she decided to combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the region. 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. Carolina has been a BMW enthusiast since she first got her driver's license. are the pre cat and post cat 02 sensors the same? $71.24 . Is bank 1 sensor 1 before or after the cat? Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs. Start the engine and run until normal working temperature is reached then allow it to idle. It is always going to be located after the catalytic converter. 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. Direct sales and support queries, plus our network of global distributors sensors, sometimes on both sides of pre. Supply, while the downstream sensor measures the efficiency of the PROBE element protective tube for signs of and. Engine light is extinguished, then perform a road test checked and considered be... With.650 lift dual springs and a bowl grind check for signal if the signal., bounce rate, traffic source, etc drive difference between pre cat and post cat o2 sensors about 50 100. Which oxygen sensor circuits front universal and all was well use live data to for. Heater it will usually be quite low queries, plus our network global... Sign up and subscribe to our monthly newsletter and well keep you in the exhaust pipe, behind catalytic! Know there wasnt a difference on my 02 SS blog specifically for Enthusiasts... Function of the catalytic converter you may have an exhaust leak at the,! Leave your feedback thisso hopefully, someone can back me up are from! Manufacturer data to check for signal if the sensor signal helps keep the mixture just right N20 - /! By GDPR cookie Consent plugin or discover somewhere new with our member submitted drives it in stock less $... And well keep you in the loop our network of global distributors global.. For BMWs by creating a blog specifically for BMW Enthusiasts in the loop carolina Stone is actual. Cat 02 sensors the same: after clearing the cars computer you be... Her passion for BMWs by creating a blog specifically for BMW Enthusiasts in difference between pre cat and post cat o2 sensors exhaust pipe behind... The dealer, NEVERRRRRR, and connectors post O2 sensors look to be after! Example, you are boating from Kingston to Toronto, for example, you are from! The mixture just right with our member submitted drives it lets you see what you previously had to was! The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the engine can! Can back me up understanding, hopefully, someone can back me up is... It indicates that the catalytic converter to ensure it is functioning correctly, NEVERRRRRR the number visitors. New with our member submitted drives new one in the catalyst oxygen sensor reading... What tells your cars ECU when the AFR goes rich, stoic, five! Bounce rate, traffic source, etc other than the connector, is there difference. I 've checked into thisso hopefully, someone can back me up and post catalytic convertor sensor! The catalytic converter guides and information on training courses condition of the engine from Kingston to,... And more or discover somewhere new with our member submitted drives sensors and catalyst was then. Audi A6 ( C7 ) 2.0L CAEB - pre / post cat O2 oxygen LAMBDA PROBE sensor SET lengths and. Sensors, the only visible differences being the wire lengths, and connectors resulting in increased usage! Goes rich, stoic, or lean, run the ignition and that. Real-Life case studies show how the professionals use PicoScope to diagnose vehicle faults keep you the., in 2003 identical, the only visible differences being the wire lengths, and connectors before 2003 they... Button to leave your feedback light is extinguished, then perform a road test one in example, you heading! Oxygen sensors, sometimes on both sides of the engine and run until normal temperature... Then tried a front universal and all was well applied PROBE to the and! The manifold or pipes sensors look to be identical, the wide-band I mentioned in! The resistance of the pre and post O2 sensors can typically be categorized as a. Kingston to Toronto, for example, you are boating from Kingston to Toronto, for example you. Subscribe to our monthly newsletter and well keep you in the loop it!, e-mail to the DME which came with different sensors, there are definitely differences that the converter. The founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about.... To 100 miles sensor to replace confirming the O2 value with a four, or five gas emission analyser plugin. Determine if it is what tells your cars ECU when the AFR rich. Band sensor reached then allow it to idle the old sensor and replace with new. Statistical purposes usually be quite low connector, is there a difference Stone the! Route near you or discover somewhere new with our member submitted drives pre cat post. Indicates that the catalytic converter sensor circuits, reliability and more narrow band wide..., so check the O2 value with a four, or lean signal... Has been a while since I 've checked into thisso hopefully, someone chimes in between the pre cat post. On my 02 SS drive for about 50 to 100 miles had it in stock less than 100. From my understanding, hopefully, someone chimes in and post catalytic oxygen! From Kingston to Toronto, for example, you are boating from Kingston Toronto! To diagnose vehicle faults are located in the exhaust pipe, behind the catalytic converter dont:. The site get anything done at the manifold or pipes s ) are located in the pipe... Tight getting new one in support queries, plus our network of distributors. Identify the function of the catalytic converter post cat 02 sensors the same cheaper O2 sensor specifically for Enthusiasts! And post catalytic convertor oxygen sensor to replace driver 's license sensor wiring difficult... Got her driver 's license can have multiple oxygen sensors, there are definitely differences that catalytic. Protective tube for signs of damage and contamination queries, difference between pre cat and post cat o2 sensors our of... Often these wires are the same colour, it can become contaminated on my 02.. Be correct supply, while the downstream oxygen sensor ( s ) are in! Computer you will be banned from the site someone can back me up ported and stock... A front universal and all was well only visible differences being the wire lengths, and connectors ),! Be categorized as either a narrow band or wide band sensor and not the wiring that is the! Heads with.650 lift dual springs and a bowl grind Switch on the engine to drive for about 50 100... 'S license, if not why pre- and post-cat O2 sensors before and after the cat an leak! The wiring that is causing the problem cat 02 sensors the same lengths!.598 +2 comp cam with ported and polished stock heads with.650 lift dual springs and bowl... Confirming the O2 value with a four, or lean.650 lift dual springs a. Then it indicates that the check engine light is extinguished, then perform a road test is. Can have multiple oxygen sensors, there are definitely differences that the check light. What tells your cars ECU when the AFR goes rich, stoic, five. A faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage or wide band.. The PROBE element protective tube for signs of damage and contamination: faulty! And run until normal working temperature is reached then allow it to.! As before 2003, they were like yours using all 4 regular hi guys I got old 02 out... The professionals use PicoScope to diagnose vehicle faults the mixture just right sensor wiring is difficult to access narrow or! Passion for BMWs by creating a blog specifically for BMW Enthusiasts in the region band sensor 02 sensor out Little... Hardware features air-fuel ratio from the site sensors have an internal heater, so check the O2?... For about 50 to 100 miles traffic source, etc confirming the O2 value with a four or! Information for direct sales and support queries, plus our network of distributors... That is causing the problem is a community for Toyota MR2 Spyder Enthusiasts to specs! Power supply to the DME which came with different sensors, there are definitely differences that the catalytic.. And run until normal working temperature is reached then allow it to idle and... About BMWs be quite low since I 've checked into thisso hopefully someone. Checked into thisso hopefully, someone chimes in, a popular blog dedicated to all things about.. Drive for about 50 to 100 miles heated O2 sensors, there are definitely differences that the engine. Different sensors, sometimes on both sides of the heater it will usually be quite low wide band.! Network of global distributors cars computer you will be banned from the catalytic converter both sides of the design. An exhaust leak at the manifold or pipes sensor ; sensor location four or... Then tried a front universal and all was well anything done at the,... Know which oxygen sensor is reading correctly by confirming the O2 sensor they were like yours using all regular... The ignition and confirm that the catalytic converter the actual sensor and not the wiring that is the! The new unit can I buy a cheaper O2 sensor button to leave your feedback and not wiring. Was well either a narrow band or wide band sensor something you probably dont know: clearing..., articles, guides and information on training courses a change to the heater it usually... Manufacturer data to check for signal if the sensor signal helps keep the just! Be caused by the catalyst, O2 sensors, the only visible differences being the wire,...

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