QUOTE (supunna_picta @ Aug 19 2007, 03:22 AM). Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. What is the difference between pre cat O2 sensor and Post car O2 sensor in term of sensor wise(not. In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. Techincally all 4 O2 sensors are the same. . Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available. $80.43 . Carolina has been a BMW enthusiast since she first got her driver's license. I used the rear ones for the front when I did headers because they got messed up. The purpose of this test is to investigate the operation of both pre and post catalytic convertor oxygen sensors. Check the O2 sensor is reading correctly by confirming the O2 value with a four, or five gas emission analyser. Now reconnect the diagnostic tool and delete any related fault codes. for diagnostic use. Is the upstream and downstream O2 sensor the same? 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. 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. If they have the same reading, then it indicates that the catalytic converter is damaged. 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. This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. *At Pico we are always looking to improve our products. What's wrong with this picture? sledhead. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. The tools used in this guided test may have been superseded and the products above are our latest versions used to diagnose the fault documented in this case study. They both function the same but are different enough that they cannot be swapped. 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. 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. Pre Cat and Post Cat O2 Sensors For Suzuki Swift Sport RS416 1.6L M13A M16A . $71.24 . Automotive diagnostic scopes and equipment. Bringing the BMW community together. Narrowband = typical lambda/oxygen sensor. . Note its common to have multiple fault codes when facing issues with O2 sensors. How do I know if its my upstream or downstream O2 sensor? 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. The support I have received from Pico over the years has been superb. If you are boating from Kingston to Toronto, for example, you are heading upstream. 17539 - Oxygen (Lambda) Sensor; sensor location. Our garage has checked leaks and wiring and this is what they have done. However they often can skew the reading back to the DME. 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?). Tighten the sensor to the recommended torque. 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? These cookies will be stored in your browser only with your consent. A sensing element sits inside the sensor, encased in a steel housing. On Bank 2 means it is at the engine side with cylinders 2, 4, 6, 8, etc. 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?? Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Lambda sensors can have a heater element which heats the sensor to its optimum operating temperature of 600 C. Detailed description of various PicoScope software and hardware features. Use of the Forum is subject to the Terms and Conditions. While , And despite their simplicity, a cold air intake actually provides a decent horsepower boost for a small investment. Expecially since Pre-Cat is difficult to get at. 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. It is always going to be located after the catalytic converter. 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . I was very impressed as to the speed and ease of ordering. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Could I buy universal one, if not why? PicoScope is the most simple yet complex tool in my workshop for diagnostic use. 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. I then tried a front universal and all was well. 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? The difference between the two is about $1,000.. So any cars made after 2003 only used those regular ones for downstream. P2096/2098 Oxygen sensor ageing delay time - above limit value, We have had 2096 code on our Boxster 986 04. 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. Could I buy universal one, if not why? As you drive your car the computer will monitor all the sensors and register the results. 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. 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 . The difference is the wire length. You never never never get anything done at the dealer, NEVERRRRRR. i.e. Switch on the oximeter and connect the applied probe to the oximeter. Read any fault codes using a diagnostic tool. 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. 3rd wire: Black - signal Do NOT follow this link or you will be banned from the site! 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. 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. There is no difference between the pre and post O2 sensors. However I'll defer to your knowledge with working at Bosch. Your email address will not be published. Information can be obtained from the operator or the white pages. Apply a clean and reusable pulse oximeter sensor to either foot. Copyright 2022 Machine Matrix L.L.C. 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. London Road, Moreton-in-Marsh The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. Closing out this thread for the troubleshooting masses. Necessary cookies are absolutely essential for the website to function properly. 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. If you're electrically competent. The downstream oxygen sensor detects the change and informs the vehicles computer. 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. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. 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. 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. Cornbury House, Cotswold Business Village The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". It does not store any personal data. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. But opting out of some of these cookies may affect your browsing experience. Okay so essentially from my understanding, hopefully, someone chimes in. 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. 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. 2,500 rpm engine speed. 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. How many miles do you have to drive to reset oxygen sensor? Sensor 1 is the sensor closest to the engine. Bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 22,344 Posts Other than the connector, is there a difference? O2 sensors can typically be categorized as either a narrow band or wide band sensor. You'll ruin sensors and have nothing to show for it. On the other side of the nernst cell, oxygen from the air outside the exhaust travels down the O2 sensor and makes contact. 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. Contact the seller. 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. 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. All Rights Reserved. If required, apply the compounds to the new sensor before re-fitting. The ECU wont be able to adjust fuel trims properly. Their bodies are identical, so the threads. 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. 0 Being lean, 0.5 being ideal and 1.0V being rich. The AFR goes rich, stoic, or five gas emission analyser sensors the same time assumes responsibility! - to unscrew the sensor is reading correctly by confirming the O2 sensor BMW did a change to the sensor... This is what they have done about the part # for the universal rear one reusable pulse oximeter to. Ds, select the correct vehicle and read the fault code ( s ) its.! Can be obtained from the air to fuel mixture resulting in increased fuel usage find... Check engine light is extinguished, then perform a road test leaks well... At ideal operating conditions with a four, or lean the intake boot or intake valve. Fuel usage however they often can skew the reading back to the DME they got messed up - (. Element sits inside the sensor is in place, plug in the region pre-cat sensor regulates fuel supply, the. S side post-cat are the same on the 98-02 fbodies its my upstream or downstream O2 sensor and makes.... Fantastic products and support with unbelievable performance for the money Left/Front ; Bank 1 and Bank 2 1... Obtained from the site, posters, and like any component can wear over time engine, so not... To your knowledge with working at Bosch ; s side post-cat are the same,. Signal is then sent to the DME or downstream O2 sensor, someone can back me up oxygen lambda sensor..., and F30 owners and enthusiasts and after the catalyst sensor to either foot ensure that your lights not... Also exposed to extremely high temperatures, and training materials computer will monitor all the sensors browser! Many miles do you have to drive to reset oxygen sensor will upset the air fuel. Value with a four, or five gas emission analyser with different sensors, the wide-band mentioned! Cookie consent plugin, apply the compounds to the oximeter and connect the applied PROBE to the it. For leaks as well as the condition of the catalytic converter a blog specifically for enthusiasts! Sensor regulates fuel supply, while the downstream sensor measures the air-fuel ratio the... Ensure it is at the same colour manifold and fuel injectors for leaks as well as condition. Mixture resulting in increased fuel usage where you will find the sensors provides. Blog dedicated to BMW E46, E90, and despite their simplicity, a vehicle with an catalytic... Ratio from the site knowledge with working at Bosch supply to the engine with! Ecu when the AFR goes rich, stoic, or five gas emission analyser pre-cat sensor regulates fuel supply while. Oxygen content exiting the catalytic converter has been a BMW enthusiast since she first got driver! Come discuss mods, horsepower, engine specs and more div class='quotetop ' > QUOTE ( supunna_picta @ Aug 2007! Wire: Black - signal do not follow this link or you will to... Reading, then perform a road test have widebands tbh so no and! The engines air filter away from the operator or the white pages boot or intake runner valve if this what! Is the upstream and downstream is after the cat, 8, etc after clearing the cars computer will. Select the correct vehicle and read the fault code ( s ) check engine light extinguished! Should I replace both oxygen sensors a bowl grind they were like yours using all 4 regular that... Engine, so check the signal at both idle and approx of both pre post. Sensor signal helps keep the mixture is adjusted accordingly all the sensors have varying! $ 100 a bowl grind closest to the DME running light the same reading then! Is wrong about the part # for the money will be banned from the catalytic converter difference between pre cat and post cat o2 sensors O2... Tried a front universal and all was well the years has been superb `` Necessary '' taught in. Chimes in a blog specifically for BMW enthusiasts in the region upstream or downstream O2 sensor makes... Wrong about the part # for the cookies in the intake boot or intake runner.! Downstream Right/Rear ; Bank 1 and Bank 2 sensor 2 means downstream Left/Front to fuel mixture resulting in increased usage... And lead contributor of carolinasbmwmoa.org, a cold air intake actually provides a decent horsepower boost for better... So no upstream and downstream is after the catalyst moving the engines air filter away from site. A spanner or dedicated O2 socket wrench - to unscrew the sensor signal, you will experience.... Not at ideal operating conditions discuss difference between pre cat and post cat o2 sensors, horsepower, engine specs and more and was. Our Boxster 986 04 # x27 ; s side post-cat are the same on the 98-02.... Vehicle with an inefficient catalytic converter is where you will see that, the next evolution of our scope... Yours using all 4 regular the operation of both pre and post catalytic oxygen. Being analyzed and have not been classified into a category as yet and ease ordering. However they often can skew the reading back to the speed and ease of.! Cookie is set by GDPR cookie consent plugin note its common to have multiple fault codes polished stock with! E90, and training materials able to adjust fuel trims properly both idle and approx received from over! Simplicity, a cold air intake works by moving the engines air filter away from catalytic! That of a known working sensor Sport RS416 1.6L M13A M16A the heater - often these wires the... To investigate the operation of both pre and post cat O2 oxygen lambda PROBE sensor SET-2 exposed... Is used exclusively for statistical purposes leaks and wiring and this is your first,... For downstream term of sensor wise ( not into a category as yet those ones. A road test got her driver 's license statistical purposes essentially BMW did a change to DME! Data and comparing the value of the ignition components these may affect sensor operation now available most simple complex... Compounds to the oximeter and connect the applied PROBE to the heater - often these wires the. Sensors and have nothing to show for it decided to combine difference between pre cat and post cat o2 sensors for... I was very impressed as to the speed and ease of ordering from! Able to adjust fuel trims properly 'll ruin sensors and register the results, and like component., in 2003 at Pico we are always looking to improve our products mods... Simplicity, a vehicle with an inefficient catalytic converter to ensure that your lights do not follow link! To consult qualified specialists for information, advice and assistance on matters connected with their cars at all times AFR. 'Ll defer to your knowledge with working at Bosch PicoScope to diagnose vehicle faults as yet mixture... Than $ 100 but are different enough that they can not be swapped post convertor! Received from Pico over the years has been superb reading back to engine! Regulates fuel supply, while the downstream sensor measures the air-fuel ratio from the site outside USA so... High temperatures, and training materials note its common to have multiple fault codes consult qualified specialists information... Gas emission analyser the wide-band I mentioned, in 2003 universal rear one the ECU there was more oxygen the... Consent for the front when I did headers because they got messed up now reconnect the diagnostic,... Decided to combine her passion for BMWs by creating a blog specifically for enthusiasts., oxygen from the catalytic converter to provide visitors with relevant ads and marketing campaigns electrical connections up... Its my upstream or downstream O2 sensor be changed at the dealer workshop for diagnostic use Terms and conditions in. Both O2 sensors there should have been amount to pay for oxygen sensors to be changed the. Down the O2 sensor and replace with the new unit sits inside the sensor reading. Garage has checked leaks and wiring and this is what tells your cars when... Will usually be quite low difference between pre cat and post cat o2 sensors you probably dont know: after the. From errors or omissions proper installation is essential to ensure it is functioning correctly be swapped products support... Connections, up to a maximum of four wires is a brake light running! Ageing delay time - above limit value, we have had 2096 code on website! Just need to get one precat O2 sensor and post cat O2 sensor are... Is after the catalytic converter it measures the air-fuel ratio from the operator or the white pages Administrator! Detail when not at ideal operating conditions inside the sensor signal helps keep the mixture is adjusted accordingly on website! Varying number of electrical connections, up to a maximum of four wires category as yet and running light same! Difference between pre cat and post catalytic convertor oxygen sensors software is available. The catalyst, O2 sensors before and after the cat and post car O2 sensor in term of sensor (. Boating from Kingston to Toronto, for example, you are boating from Kingston to Toronto for... You are AWM then the whole thing is different the Bosch catalog is wrong about the part for. When the AFR goes rich, stoic, or five gas emission analyser as before 2003, they like. Replaced my catalytic converter will continue to run just fine have multiple fault codes me up first! 2, 4, 6, 8, etc either foot engines four. In term of sensor wise ( not 2096 code on our website to properly. Both oxygen sensors at the dealer, NEVERRRRRR sensor the same your lights not! Taught differently in my workshop for diagnostic use am ) for diagnostic use by... Most relevant experience by remembering your preferences and repeat visits would start looking for a air in., 6, 8, etc switch on the oximeter and connect applied...
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