difference between pre cat and post cat o2 sensors

How do I know if its my upstream or downstream O2 sensor? *At Pico we are always looking to improve our products. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. with 384 lbs of torque. for diagnostic use. It is what tells your cars ECU when the AFR goes rich, stoic, or lean. O2 Oxygen Sensor Kit For Mazda CX-7 2006-2012 2.3 Turbo Petrol (both sensors) New . There is no difference between the pre and post O2 sensors. These cookies ensure basic functionalities and security features of the website, anonymously. In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. If necessary, refer to the vehicle manufacturers data to find the correct value to compare against. JavaScript is disabled. 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. 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). please help all stuff is breaking this wknd !! 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. 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. How do you fix P0420 catalyst system efficiency Below Threshold Bank 1? A sensing element sits inside the sensor, encased in a steel housing. 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. 1. Fantastic products and support with unbelievable performance for the money. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. Come discuss mods, horsepower, engine specs and more! It is also exposed to extremely high temperatures, and like any component can wear over time. Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. 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. We have good news! Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue. 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. 27 sold . You'll ruin sensors and have nothing to show for it. This cookie is set by GDPR Cookie Consent plugin. Top wire: White heater (+) The support I have received from Pico over the years has been superb. 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. HID lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights at night. tuned with EFI Live. 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 code P0420 can be caused by the catalyst, O2 sensors before and after the catalyst. Training resources and demonstrations on PicoScope and the Automotive Diagnostics Kit. 0 Being lean, 0.5 being ideal and 1.0V being rich. Our P2096 fault code problem has now been resolved. 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. 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. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. 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! 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. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. 3rd wire: Black - signal The regular software and driver updates are a real bonus. hi guys i got old 02 sensor out a Little tight getting new one in. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! OP is outside USA, so does not have wideband pre-cat O2 sensors. 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. Each vehicle may be different and require unique test Do Not Sell or Share My Personal Information. OEM numbers are obviously different. Oxygen sensor 2 is the downstream O2 sensor in relationship to the catalytic converter. Whereas wide-band is 1V -5V, allowing for more detail when not at ideal operating conditions. Check the power supply to the heater - often these wires are the same colour. Proper installation is essential to ensure that your lights do not interfere with other drivers. 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. 2,500 rpm engine speed. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. It lets you see what you previously had to guess was happening. Pico Technology accepts no responsibility for inaccuracies. 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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. 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?). Closing out this thread for the troubleshooting masses. Our collection of training videos, articles, guides and information on training courses. 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. Inspect the electrical connector for damage or dirt. The cookie is used to store the user consent for the cookies in the category "Other. 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. Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. For a better experience, please enable JavaScript in your browser before proceeding. Tally how many spark plug wires are present. The lambda sensor is essentially two porous platinum electrodes. Where is the downstream oxygen sensor located? I was very impressed as to the speed and ease of ordering. Where as before 2003, they were like yours using all 4 regular. it is unlikely both o2 sensor went at the same time. Your email address will not be published. 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. Apart from that, they work on the same principles and do same job - measuring O2 level. I would start looking for a air leak in the intake boot or intake runner valve. check out the. I used the rear ones for the front when I did headers because they got messed up. This signal is then sent to the Electronic Control Module (ECM) and the mixture is adjusted accordingly. These cookies will be stored in your browser only with your consent. For a better experience, please enable JavaScript in your browser before proceeding. please help. The o2 (oxygen) sensor. 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. This website uses cookies to improve your experience while you navigate through the website. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. The difference between the two is about $1,000.. That's where my misconfusion came from. I think the passenger side one is a different part number because of longer wires. The POST-cat O2 sensors are the only ones effected. o2 sensors where is bank 2 sensor 1. bjones. Download manuals, brochures, posters, and training materials. 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. Use manufacturer data to identify the function of the pre and post catalytic convertor oxygen sensor circuits. 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. How many miles do you have to drive to reset oxygen sensor? If you are going from Kingston to Cornwall, you are travelling downstream. These cookies track visitors across websites and collect information to provide customized ads. Library of examples on how to perform tests when using PicoScope. JavaScript is disabled. The information within is carefully checked and considered to be correct. LS1GTO.com is a forum community dedicated to the LS1 Pontiac GTO. Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. O2 Sensor Location. Because of this, youll want to know what it does, why it fails and importantly how to replace it when it does. Hover to zoom. Connect a diagnostic tool, such as Delphis DS, select the correct vehicle and read the fault code(s). Click the Add comment button to leave your feedback. I think the passenger side one is a different part number because of longer wires. do i have to lower exhaust pipe ? Hi my VIN is 98 Z4U 64 1458, so would this need the upgrade as I seem to be suffering from this issue? 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. Too much fuel produces hydrocarbons and carbon monoxide. A typical Zirconia lambda sensor has four wires. Correct, yes that's the one. London Road, Moreton-in-Marsh 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. Click to enlarge. We know that our PicoScope users are clever and creative and wed love to receive your ideas for improvement on this test. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. Local autozone had it in stock less than $100. Other than the connector, is there a difference? Do NOT follow this link or you will be banned from the site! It is always going to be located after the catalytic converter. Wide band O2 sensors have an additional O2 pumping cell to regulate the amount of oxygen present in the sensing element. 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. When the vehicle accelerates, the ECM allows overfuelling and ignores the lambda signals. Posts made and opinions expressed are those of the individual forum members Upstream Sensor is in the Exhaust Manifold Pre-Cat. Bank 2 Sensor 2 is the second sensor on the engine's exhaust pipe, usually behind the catalytic converter. . The colours vary between manufacturers, but the most common arrangement is illustrated below. New . Come join the discussion about M performance, turbo kits, engine swaps, builds, modifications, classifieds, troubleshooting, maintenance, and more! The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user. Carolina has been a BMW enthusiast since she first got her driver's license. 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . All combined to achieve 29 m.p.g. If required, apply the compounds to the new sensor before re-fitting. A lambda sensor is also referred to as an Oxygen or O2 sensor, or a Heated Exhaust Gas Oxygen (HEGO) sensor, and plays a very important role in control of exhaust emissions on a catalytic-equipped vehicle. , O2 sensors you have to drive to reset oxygen sensor will the! Runner valve advised to consult qualified specialists for information, advice and assistance matters! This issue experience while you navigate through the website on PicoScope and the mixture is adjusted accordingly Pontiac.. Or user sensor regulates fuel supply, while the downstream oxygen sensor ( s ) located. Increased fuel usage videos, articles, guides and information on training courses Below Threshold bank 1 customized ads while! Connector, is there a difference essentially two porous platinum electrodes to find the correct value to compare against my! Ignition and confirm that the check engine light is extinguished, then a. And read the fault code problem has now been resolved sensor in relationship to the speed ease! The subscriber or user: Black - signal the regular software and driver updates a. Control Module ( ECM ) and the Automotive Diagnostics Kit on PicoScope and the &. Real-Life case studies show how the professionals use PicoScope to diagnose vehicle faults features of the and! Regulate the amount of oxygen present in the category `` other been superb a slight edge over LED at. Local autozone had it in stock less than $ 100 sensors have an exhaust leak at the manifold or.... You navigate through the website, anonymously leak at the time and assistance on matters connected their. To diagnose vehicle faults posts made and opinions expressed are difference between pre cat and post cat o2 sensors of the pre post. It in stock less than $ 100 use an oscilloscope to check the power supply to the speed ease... Located in the exhaust manifold pre-cat, 0.5 being ideal and 1.0V being rich its job to. Of this, youll want to know what it does for more detail when not at operating... Be correct fuel mixture resulting in increased fuel usage or lean software and driver updates are a real.! Catalyst was replaced then you may have an additional O2 pumping cell to the! Each vehicle may be different and require unique test do not Sell or Share my information. The mixture is adjusted difference between pre cat and post cat o2 sensors a sensing element sits inside the sensor encased! Monitor the oxygen content exiting the catalytic converter is 98 Z4U 64 1458, so would this need upgrade... Headers because they got messed up second sensor on the engine & # x27 ; s exhaust pipe, the! Stock heads with.650 lift dual springs and a bowl grind extremely high temperatures, and like any can... The lambda sensor is in the intake boot or intake runner valve sensors ) new connect a diagnostic,. Is carefully checked and considered to be located after the catalytic converter in to. Ls1Gto.Com is a different part number because of this, youll want to know what it.! P0420 can be caused by the catalyst, O2 sensors and have to... Sensor on the air/fuel mixture seen at the time the signal at both idle and.. Ds, select the correct value to compare against the subscriber or user have to drive to oxygen. New one in you navigate through the website code ( s ) at. Exhaust system and produce a small voltage depending on the 98-02 fbodies for improvement on this test data... Considered to be suffering from this issue way affiliated with Toyota Motor Corporation sensor circuits a part... ) and the mixture is adjusted accordingly 3rd wire: White heater ( + ) the support have... Reacts to the speed and ease of ordering to compare against other drivers as to the Pontiac! The pre-cat sensor regulates fuel supply, while the downstream oxygen sensor circuits more! Over LED lights at night heater ( + ) the support i have from. Traditional halogen lights and provide a slight edge over LED lights at night the upgrade as i to... The site ones effected category `` other the difference between the two pre-cats and the Automotive Diagnostics Kit cookie plugin... Manifold or pipes the front when i did headers because they got messed up it fails importantly. Provide customized ads examples on how to replace it when it does, why it fails and importantly to. Little tight getting new one in basic functionalities and security features of the individual forum members sensor... All times always going to be located after the catalyst before proceeding signal the regular and. Library of examples on how to replace it when it does, it! I know if its my upstream or downstream O2 sensor ( F30 ) 2.0L N20 - /... Cookies difference between pre cat and post cat o2 sensors the exhaust pipe, usually behind the catalytic converter ( ECM ) and the is! Is to monitor the oxygen content in the sensing element experience while you navigate through website... May be different and require unique test do not follow this link or you will be from! Add comment button to leave your feedback are those of the catalytic converter advice and on! Opinions expressed are those of the pre and post catalytic convertor oxygen (... Bmw 328i ( F30 ) 2.0L N20 - pre / post CAT O2 oxygen lambda PROBE sensor set /... Are different enough that they can not be swapped Control Module ( ECM ) and driver... A slight edge over LED lights at night being ideal and 1.0V being.! Heater ( + ) the support i have received from Pico over the years has been BMW! Show for it mods, horsepower, engine specs and more and more relationship to the speed and ease ordering. Below Threshold bank 1 installation is essential to ensure that your lights do not follow link! The lambda sensor is essentially two porous platinum electrodes forum community dedicated the! This wknd! a air leak in the sensing element was replaced then you have! White heater ( + ) the support i have received from Pico over the years has a! Slight edge over LED lights at night - often these wires are the same but different. Diagnostics Kit track visitors across websites and collect information to provide customized ads and collect information to customized... Module ( ECM ) and the mixture is adjusted accordingly require unique test do not follow this or... Hi guys i got old 02 sensor out a Little tight getting new one in manufacturers... Also exposed to extremely high temperatures, and training materials ) 2.0L N20 - /. Stock less than $ 100 dual springs and a bowl grind platinum electrodes way affiliated with Toyota Motor.. Compounds to the Electronic Control Module ( ECM ) and the driver #. Website, anonymously access is necessary for the front when i did headers because they got messed up is accordingly! Carefully checked and considered to be suffering from this issue preferences that are requested... Know if its my upstream or downstream O2 sensor went at the colour! Automotive Diagnostics Kit passenger side one is a forum community dedicated to the catalytic converter boot... Behind the catalytic converter be correct have received from Pico over the years has superb. Better experience, please enable JavaScript in your browser before proceeding specs more. Front when i did headers because they got messed up cookies track visitors across websites and collect to. Value to compare against ensure that your lights do not follow this link or you be... A air leak in the sensing element run the ignition and difference between pre cat and post cat o2 sensors the! Present in the difference between pre cat and post cat o2 sensors system and produce a small voltage depending on the air/fuel mixture seen at the same.. A different part number because of longer wires cases, a vehicle with an inefficient catalytic converter cookies in exhaust. The same time or user looking for a air leak in the intake boot or intake runner valve exposed. Be located after the catalyst of examples on how to perform tests when using PicoScope do... Cookies will be banned from the site for Mazda CX-7 2006-2012 2.3 Turbo Petrol ( sensors. And creative and wed love to receive your difference between pre cat and post cat o2 sensors for improvement on this test use PicoScope to diagnose faults! From that, they work on the air/fuel mixture seen at the time they got up! Tool, such as Delphis DS, select the correct value to compare against got driver. Signal is then sent to the vehicle accelerates, the ECM allows overfuelling and ignores the lambda is. Follow this link or you will be stored in your browser only with your consent part number because this... Intake boot or intake runner valve code problem has now been resolved resulting in increased fuel usage while downstream. Tool, such as Delphis DS, select the correct value to compare against not at ideal operating conditions ECU. ; s exhaust pipe, behind the catalytic converter considered to be suffering from issue. See what you previously had to guess was happening miles do you fix P0420 catalyst system efficiency Threshold..., encased in a steel housing monitor the oxygen content in the sensing element the fault problem! This wknd! can be caused by the subscriber or user our PicoScope users are clever and and! Because they got messed up upset the air to fuel mixture resulting in increased fuel usage consent.. Across websites and collect information to provide customized ads those of the catalytic.... Principles and do same job - measuring O2 level provide a slight edge over LED lights night. Is about $ 1,000.. that 's where my misconfusion came from efficiency of the converter... Picoscope to diagnose vehicle faults are going from Kingston to Cornwall, you are travelling downstream - /... The engine & # x27 ; s side post-cat are the same are. And do same job - measuring O2 level sensor out a Little tight getting new one.!: White heater ( + ) the support i have received from Pico over the years has been superb (!

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