difference between pre cat and post cat o2 sensors

Each vehicle may be different and require unique test 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. Pre Cat and Post Cat O2 Sensors For Suzuki Swift Sport RS416 1.6L M13A M16A . A forum community dedicated to BMW owners and enthusiasts. 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. 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. Post-cat O2 sensors have much longer wires thus they cost a bit more. If you decide to do this long term, you will experience problems. 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. You just need to get one precat O2 sensor. In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. The sensor signal helps keep the mixture just right. You may have widebands tbh so no upstream and down stream would be different. HID lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights at night. I cant help with the torque readings (or the tech builtin above but I'll keep going) but its easy to forgot that the O2 sensor is only reporting what it's seeing and the default reaction of replacing the O2 sensor is literally just shooting the messenger. Don't do it. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. A sensing element sits inside the sensor, encased in a steel housing. 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. OP is outside USA, so does not have wideband pre-cat O2 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). The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your 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. are the pre cat and post cat 02 sensors the same? This enables the sensor to be located further away from the heat source at the manifold to a 'cleaner' location. If necessary, refer to the vehicle manufacturers data to find the correct value to compare against. Pre- and poscat sensors have different wire length and pre-cat is male, post cat is female connectors. sledhead. 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. 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. New . The downstream oxygen sensor detects the change and informs the vehicles computer. it is unlikely both o2 sensor went at the same time. Minimize the help page. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. 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 . JavaScript is disabled. with 384 lbs of torque. carolinasbmwmoa.org quickly gained a following, and Carolina now leads a team of contributors who share their experiences and knowledge about BMWs. It is also exposed to extremely high temperatures, and like any component can wear over time. On an oscilloscope, the resultant waveform should look as the illustration above. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. Sign up and subscribe to our monthly newsletter and well keep you in the loop. How do you fix P0420 catalyst system efficiency Below Threshold Bank 1? These cookies ensure basic functionalities and security features of the website, anonymously. Be careful not to put excessive amounts of anti-seize onto the threads as this could contaminate the sensing area. However I'll defer to your knowledge with working at Bosch. The catalytic converter maintains the stoichiometric air-fuel ratio of 14.7:1. Proper installation is essential to ensure that your lights do not interfere with other drivers. However they often can skew the reading back to the DME. If the frequency of the switching is slower than expected, removing the sensor and cleaning it with a solvent spray may improve the response time. The Club assumes no responsibility for any effects arising from errors or omissions. There is no different part number for bank1 and bank2. The cookie is used to store the user consent for the cookies in the category "Analytics". functioning wise) Also, where can I buy a cheaper O2 sensor? Inspect the electrical connector for damage or dirt. After 10 or 12 years, your oxygen sensors usually have to be replaced, that is normal, and you should replace both of them for better gas mileage performance of the car. Honestly, with narrow band sensors, it WILL work. Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. Both pre-cat sensors are identical. 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. How do I know if its my upstream or downstream O2 sensor? 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . 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. You also have the option to opt-out of these cookies. 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . . Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. Automotive diagnostic scopes and equipment. 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. 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! 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. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. Use manufacturer data to identify the function of the pre and post catalytic convertor oxygen sensor circuits. O2 Sensor Location. These cookies will be stored in your browser only with your consent. This cookie is set by GDPR Cookie Consent plugin. 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. 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. Wide band O2 sensors have an additional O2 pumping cell to regulate the amount of oxygen present in the sensing element. The downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter. They both function the same but are different enough that they cannot be swapped. Hover to zoom. 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. 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? JavaScript is disabled. I then tried a front universal and all was well. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. This also happens during initial warm-up. When the vehicle accelerates, the ECM allows overfuelling and ignores the lambda signals. A vehicle equipped with a lambda sensor is said to have 'closed loop', which means that after the fuel has been burnt during the combustion process, the sensor analyzes the resultant emissions and readjusts the engine's fuelling accordingly. All combined to achieve 29 m.p.g. Not having ordered on the internet before i didnt struggle at all. Information can be obtained from the operator or the white pages. Analytical cookies are used to understand how visitors interact with the website. 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. Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. 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. 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. Library of examples on how to perform tests when using PicoScope. 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. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide. Should I replace both oxygen sensors at the same time? Posts made and opinions expressed are those of the individual forum members Our support forum where 16,000+ users (including Pico staff) discuss all things PicoScope Automotive. Carolina has been a BMW enthusiast since she first got her driver's license. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. Apart from that, they work on the same principles and do same job - measuring O2 level. ,t.c.bypass,descreened m.a.f. Use live data to check for signal if the sensor wiring is difficult to access. 27 sold . 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. 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. $64.34 . It is always going to be located after the catalytic converter. Necessary cookies are absolutely essential for the website to function properly. 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. Pico Technology accepts no responsibility for inaccuracies. sorry supunna that lest post was for your info not WTS, WTS I have a garage queen back roads only the freeway is way to boaring try not to whine so mutch i posted the info was for supunna not you get over it. Could I buy universal one, if not why? 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. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. You will see that, The pre catalytic converter sensor signal. 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. As you drive your car the computer will monitor all the sensors and register the results. OEM numbers are obviously different. 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. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. 2,500 rpm engine speed. 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. The time taken for a good trace may vary between 30 seconds to 2 minutes. Our collection of training videos, articles, guides and information on training courses. The pre catalytic converter signal transitions, from lean to rich or vice versa, take around 0.5 s. The post catalytic converter sensor signal. The code P0420 can be caused by the catalyst, O2 sensors before and after the catalyst. But opting out of some of these cookies may affect your browsing experience. Since the oxygen sensor is in the exhaust stream, it can become contaminated. Bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 22,344 Posts 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. The technical storage or access that is used exclusively for statistical purposes. Picture Information. 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. The "pre-cat sensor" regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. This page could not be found. JavaScript is disabled. This allows measurement of a much wider air/fuel ratio. In turn, the computer activates the check engine light and logs code P0430. for diagnostic use. The Titania Oxygen sensor differs from the Zirconia sensor in that it is incapable of producing its own output voltage and is therefore reliant on a 5-volt supply from the vehicle's ECM. 17539 - Oxygen (Lambda) Sensor; sensor location. It's been a while since I've checked into thisso hopefully, someone can back me up. Do universal sensors work, well yes. 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. A typical Zirconia lambda sensor has four wires. Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. Other tooling or equipment may be required to determine if it is the actual sensor and not the wiring that is causing the problem. For a better experience, please enable JavaScript in your browser before proceeding. Does it matter which 02 sensor goes where? $71.24 . The POST-cat O2 sensors are the only ones effected. OEM sensors uncut/repaired/altered give a true read of the gases both per/post catalyst. Cornbury House, Cotswold Business Village If this is your first visit, be sure to How many miles do you have to drive to reset oxygen sensor? Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Other than the connector, is there a difference? These cookies track visitors across websites and collect information to provide customized ads. Detailed description of various PicoScope software and hardware features. What is the difference between pre cat O2 sensor and Post car O2 sensor in term of sensor wise(not. 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. 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? 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. I think the passenger side one is a different part number because of longer wires. - If a post-cat sensor was modified so it could be installed as a pre-cat sensor, would it work? The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user. Bank 2 Sensor 1 means Upstream Left/Front; Bank 1 Sensor 2 means Downstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front. Too little fuel produces nitrogen-oxide pollutants. check out the. London Road, Moreton-in-Marsh Switch on the oximeter and connect the applied probe to the oximeter. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Confirm the fault code by selecting live data and comparing the value of the suspect faulty sensor to that of a known working sensor. Bank 2 Sensor 1 is the first sensor closest to the engine. 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. This cookie is set by GDPR Cookie Consent plugin. I was very impressed as to the speed and ease of ordering. Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Upstream Sensor is in the Exhaust Manifold Pre-Cat. 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. please help all stuff is breaking this wknd !! Wow that is a crazy amount to pay for oxygen sensors to be changed at the dealer! 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 most commonly used sensor has a Zirconia element, producing a voltage when there is a difference in oxygen content between the two electrodes. 2nd wire: White heater (-) 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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