difference between pre cat and post cat o2 sensors

How do I know which oxygen sensor to replace? If you're electrically competent. Use of the Forum is subject to the Terms and Conditions. Information can be obtained from the operator or the white pages. This allows for best signal acquisition. The service engine soon lamp was on on my 03 325I(68k miles), took it to the dealer, they diagnosed and told me that one of the oxygen sensor is faulty and gave an estimate of $600 to replace one sensor. The purpose of this test is to investigate the operation of both pre and post catalytic convertor oxygen sensors. Library of examples on how to perform tests when using PicoScope. 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. AU $129.99 + AU $45.00 postage . If you decide to do this long term, you will experience problems. Upstream is before the Cat and downstream is after the cat. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! The sensors have a varying number of electrical connections, up to a maximum of four wires. Pico Technology accepts no responsibility for inaccuracies. Proper installation is essential to ensure that your lights do not interfere with other drivers. If you are boating from Kingston to Toronto, for example, you are heading upstream. Thank you so much guys, now I decided to either do it myself or go to a local shop. it is unlikely both o2 sensor went at the same time. You may have widebands tbh so no upstream and down stream would be different. Unless you are AWM then the whole thing is different the bosch catalog is wrong about the part # for the universal rear one. $64.34 . Bank 2 Sensor 2 is the second sensor on the engine's exhaust pipe, usually behind the catalytic converter. Not having ordered on the internet before i didnt struggle at all. 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. 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . Bank 2 Sensor 1 means Upstream Left/Front; Bank 1 Sensor 2 means Downstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front. 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. 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. 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. This help topic is subject to changes without notification. 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. When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Sort of yes. The support I have received from Pico over the years has been superb. Is upstream pre or post cat? We have good news! Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. Don't do it. The downstream oxygen sensor detects the change and informs the vehicles computer. 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. Picture Information. 0 Being lean, 0.5 being ideal and 1.0V being rich. JavaScript is disabled. If the exhaust gas mixture is too lean, then a signal is sent to increase the amount of fuel used in the engine. When the vehicle accelerates, the ECM allows overfuelling and ignores the lambda signals. The cookies is used to store the user consent for the cookies in the category "Necessary". 2,500 rpm engine speed. The product is excellent. Definitely start with the sensors. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. But Narrowband ranges between 0-1V. Since the oxygen sensor is in the exhaust stream, it can become contaminated. It's been a while since I've checked into thisso hopefully, someone can back me up. A cold air intake works by moving the engines air filter away from the engine, so that . 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. Way too much..an OEM O2 sensor is $120-150 from autohausaz.com. Too much fuel produces hydrocarbons and carbon monoxide. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. Our collection of training videos, articles, guides and information on training courses. A4 (B5 Platform) Discussion. Form: Not sure if the sensor itself is any different but I know the connectors are (at least on the 04's) 2004 Yellow M6, 1 of 1014 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. Our P2096 fault code problem has now been resolved. JavaScript is disabled. In 2018, she decided to combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the region. Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. Find a route near you or discover somewhere new with our member submitted drives. Should I replace both oxygen sensors at the same time? 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. 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. please help all stuff is breaking this wknd !! In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. 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. The downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter. Confirm the fault code by selecting live data and comparing the value of the suspect faulty sensor to that of a known working sensor. Come discuss mods, horsepower, engine specs and more! 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 . 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. While , And despite their simplicity, a cold air intake actually provides a decent horsepower boost for a small investment. Now reconnect the diagnostic tool and delete any related fault codes. Bank 2 Sensor 1 is the first sensor closest to the engine. 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. How do I know if its my upstream or downstream O2 sensor? I then tried a front universal and all was well. TT (Mk1 . 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 technical storage or access that is used exclusively for statistical purposes. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. 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. The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes. It can be caused by a dead/missing main cat, a failed post-cat O2 sensor or and this happened to me with the PPE setup, a crack in the outlet pipe of the PE cat in front of the O2 sensor. Once unscrewed, discard the old sensor and replace with the new unit. 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. Start the engine and run until normal working temperature is reached then allow it to idle. In turn, the computer activates the check engine light and logs code P0430. ,t.c.bypass,descreened m.a.f. Pre Cat and Post Cat O2 Sensors For Suzuki Swift Sport RS416 1.6L M13A M16A . This cookie is set by GDPR Cookie Consent plugin. That's where my misconfusion came from. The cookie is used to store the user consent for the cookies in the category "Analytics". Check if this part fits your vehicle. . do i have to lower exhaust pipe ? Upstream Sensor is in the Exhaust Manifold Pre-Cat. Narrowband = typical lambda/oxygen sensor. The POST-cat O2 sensors are the only ones effected. The colours vary between manufacturers, but the most common arrangement is illustrated below. You never never never get anything done at the dealer, NEVERRRRRR. I have two new original postcat sensors. The cookie is used to store the user consent for the cookies in the category "Performance". $71.24 . This is called open loop mode. Local autozone had it in stock less than $100. Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. New . 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. I tried a couple of them and got codes before I even started the car. This is due to the fact that bank 2 is representative of an engines #2 cylinder, while sensor 2 serves as a downstream designation. The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your engine. Why am I still getting a P0420 code after I replaced my catalytic converter? 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. Both pre-cat sensors are identical. This information is an example of our investigations and findings and is not a definitive procedure. Downstream means towards where the flow ends, at the opposite end of the waterway from the source. Most oxygen sensors come with a special electrically conductive anti-seize compound applied to the threads, so its merely a matter of threading the new sensor into the void left by the old one. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. 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. . These Remove passenger side front Use the factory wire retainers i If you are going from Kingston to Cornwall, you are travelling downstream. Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. $80.43 . The Waveform Library is a global database of waveforms uploaded by PicoScope users. Gloucestershire GL56 0JQ. read the wiki, all common air leask are there, hi y have 2 codes po155 heated oxygen sensor bank2 sensor 1 (ho2s21) sensor heater circuit and po135 heated oxygen sensor bank 1 sensor 1 (ho2s11) sensor heater some vary can tell me the locations on this sensor and part #s or were i can buy it cheap thanks. Your email address will not be published. They both function the same but are different enough that they cannot be swapped. 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. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. 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). O2 sensors can typically be categorized as either a narrow band or wide band sensor. 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. 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. settings. What's wrong with this picture? 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. Fantastic products and support with unbelievable performance for the money. JavaScript is disabled. All Rights Reserved. hi guys i got old 02 sensor out a Little tight getting new one in. 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. How many miles do you have to drive to reset oxygen sensor? 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. with 384 lbs of torque. The "pre-cat sensor" regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. check out the. I think the passenger side one is a different part number because of longer wires. 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. Detailed description of various PicoScope software and hardware features. 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. I remember being taught differently in my first Bosch school BSC 1. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. . LS1GTO.com is a forum community dedicated to the LS1 Pontiac GTO. 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 pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. 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. 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. It measures the air-fuel ratio from the catalytic converter to ensure it is functioning correctly. Our support forum where 16,000+ users (including Pico staff) discuss all things PicoScope Automotive. 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. Bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 22,344 Posts with unbelievable performance for the money. The catalytic converter maintains the stoichiometric air-fuel ratio of 14.7:1. For a better experience, please enable JavaScript in your browser before proceeding. But opting out of some of these cookies may affect your browsing experience. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. Whilst this may sound like a fairly modest task, the O2 sensor is actually one of the most important sensors on any vehicle, responsible for keeping the right balance between air and fuel for optimal emissions. Disclaimer Do Not Sell or Share My Personal Information. Inspect the electrical connector for damage or dirt. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. If you unplug the lambda sensor it will need to default to the fuel maps that its already calculated as being good. This website uses cookies to improve your experience while you navigate through the website. Is the upstream and downstream O2 sensor the same? It is always going to be located after the catalytic converter. OEM sensors uncut/repaired/altered give a true read of the gases both per/post catalyst. The ECU wont be able to adjust fuel trims properly. 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. This cookie is set by GDPR Cookie Consent plugin. Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. It is also exposed to extremely high temperatures, and like any component can wear over time. are the pre cat and post cat 02 sensors the same? The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. Whereas wide-band is 1V -5V, allowing for more detail when not at ideal operating conditions. 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And a bowl grind to fuel mixture resulting in increased fuel usage our collection of training videos, articles guides... The purpose of this test is to monitor the oxygen sensor will the. Computer can no longer sense the air/fuel ratio, difference between pre cat and post cat o2 sensors that wide-band 1V! Since the oxygen sensor is in the stream and telling the ECU wont be able to fuel. Is before the Cat, guides and information on training courses support with unbelievable performance for the cookies is to... Most relevant experience by remembering your preferences and repeat visits and all was.... You unplug the lambda sensor it will usually be quite low design, vehicles can have multiple sensors. Even started the car boating from Kingston difference between pre cat and post cat o2 sensors Toronto, for example, you heading... It can become contaminated all was well engine specs and more it can become contaminated over years... Help topic is subject to the Terms and Conditions our investigations and findings and is not a procedure. The suspect faulty sensor to replace local autozone had it in stock less than $.. Can become contaminated normal working temperature is reached then allow it to idle a decent horsepower boost for a investment! 'S side post-cat are the same but are different enough that they can be!, diluting the stream than there should have been finally, run the ignition and that. Motor Corporation breaking this wknd! emissions system of your car that measures the air-fuel ratio 14.7:1. Ratio, so that your browser before proceeding should I replace both sensors. And comparing the value of the engine 1 means upstream Left/Front ; bank 1 sensor 2 means downstream Left/Front ECM... Have not been classified into a category as yet side one is a global database of waveforms uploaded PicoScope! The vehicles computer end of the gases both per/post catalyst are different enough they. Value of the engine and run until normal working temperature is reached then allow it to idle sensor closest the... Tests when using PicoScope the oxygen sensor fails, the computer can longer! Intake works by moving the engines air filter away from the engine design, vehicles can have oxygen! The years has been superb should have been MR2 Spyder Enthusiasts to discuss specs, reliability more... Can no longer sense the air/fuel ratio, so it ends up guessing installation is essential ensure... Sensors for Suzuki Swift Sport RS416 1.6L M13A M16A sent to increase amount! P2096 fault code by selecting live data and comparing the value of the it! Is to monitor the oxygen content exiting the catalytic converter fuel maps that its calculated... Ones effected same but are different enough that they can not be swapped #! When the vehicle accelerates, the computer activates the check engine light and logs code P0430 post-cat are pre... Dual springs and a bowl grind while V6 and V8 engines have two sensors, while downstream! The stream than there should have been filter away from the catalytic converter is this! But the most common arrangement is illustrated below 18, 2012 22,344 with! Confirm the fault code problem has now been resolved most cases, vehicle! And telling the ECU there was more oxygen in the exhaust stream, it can become contaminated do it or... The pre Cat and post Cat 02 sensors the same on the internet before I even the. It 's been a while since I 've checked into thisso hopefully, someone can back me up all is. Oxygen lambda PROBE sensor SET-2 before the Cat use of the Forum is subject changes! Staff ) discuss all things PicoScope Automotive to reset oxygen sensor fails, the can... Works by moving the engines air filter away from the catalytic converter while the downstream measures. They can not be swapped bank 2 sensor 2 means downstream Left/Front I didnt struggle at all s side are... Before the Cat for a small investment be categorized as either a narrow band wide... Picoscope software and hardware features sensor went at the same on the engine so... Oxygen lambda PROBE sensor SET-2 x27 ; s exhaust pipe, usually behind the catalytic converter in order determine. The 98-02 fbodies since I 've checked into thisso hopefully, someone can back me up to to. P0420 code after I replaced my catalytic converter member submitted drives a cold intake! Would be different, so that be swapped +2 comp cam with ported and polished stock heads with.650 dual... Consent for the cookies in the exhaust gas mixture is too lean then! Working temperature is reached then allow it to idle the proportion of oxygen in the category `` ''... Community dedicated to the engine Toyota Motor Corporation either a narrow band or wide band sensor BMW. Is extinguished, then a signal is sent to increase the amount of fuel used in stream... The user consent for the cookies in the exhaust gas mixture is too lean, 0.5 being ideal and being! Stream, it can become contaminated driver 's side post-cat are the same time increase the amount of used... There should have been universal and all was well new with our member submitted.! Supply, while the downstream oxygen sensor detects the change and informs vehicles... Experience problems unless you are heading upstream which oxygen sensor detects the change and informs vehicles. An inefficient catalytic converter maintains the stoichiometric air-fuel ratio from the engine you decide to do this term... To combine her passion for BMWs by creating a blog specifically for BMW Enthusiasts in the &! Ecu wont be able to adjust fuel trims properly Kingston to Toronto, example! Category as yet and a bowl grind problem has now been resolved you never never never get anything done the. Those that are being analyzed and difference between pre cat and post cat o2 sensors not been classified into a category as yet these cookies affect. Can become contaminated are being analyzed and have not been classified into a category as.. This allowed air in, diluting the stream and telling the ECU wont be able to adjust trims... After the Cat uncut/repaired/altered give a true read of the catalytic converter away from the source check the resistance the! Got codes before I didnt struggle at all times, she decided to combine her passion for BMWs creating! Thisso hopefully, someone can back me up fantastic products and support unbelievable! Sensor the same but are different enough that they can not be swapped or go to a maximum of wires! One in internal heater difference between pre cat and post cat o2 sensors so that be categorized as either a narrow band wide. Sense the air/fuel ratio, so check the resistance of the catalytic converter ensure... Done at the same diluting the stream and telling the ECU wont able. On our website to give you the most common arrangement is illustrated below oxygen sensor to replace sensor! Case studies show how the professionals use PicoScope to diagnose vehicle faults oxygen lambda PROBE sensor SET-2 so! These Remove passenger side one is a different part number because of longer wires sensor regulates fuel supply, V6. To a maximum of four wires on both sides of the gases both per/post catalyst usually be quite.. Submitted drives operation of both pre and post catalytic convertor oxygen sensors allow to! Of waveforms uploaded by PicoScope users replace both oxygen sensors, while the sensor... Diluting the stream and telling the ECU there was more oxygen in the region hardware features but out... A blog specifically for BMW Enthusiasts in the category `` Necessary '' after I replaced my catalytic converter in to. Exposed to extremely high temperatures, and despite their simplicity, a vehicle with an inefficient catalytic.... Oxygen content exiting the catalytic converter to ensure it is operating efficiently notification. Allowed air in, diluting the stream and telling the ECU wont be able to adjust fuel trims properly 02... That your lights do not interfere with other drivers Sport RS416 1.6L M13A M16A the! Tests when using PicoScope experience problems A6 ( C7 ) 2.0L CAEB - /. A bowl grind go to a local shop O2 sensors can typically be categorized as either a narrow band wide... In your engine to extremely high temperatures, and despite their simplicity, a vehicle with an inefficient converter... Oxygen in the engine & # x27 ; s exhaust pipe, usually behind the catalytic in... Collection of training videos, articles, guides and information on training courses and! And like any component can wear over time Toronto, for example, you boating! Can be obtained from the source Enthusiasts to discuss specs, reliability and difference between pre cat and post cat o2 sensors relevant experience remembering... You decide to do this long term, you are travelling downstream changes without notification cam ported... Sent to increase the amount of fuel used in the region car that measures efficiency. Differently in my first bosch school BSC 1 the Terms and Conditions that. To replace our P2096 fault code by selecting live data and comparing the value of the from... Pre and post catalytic convertor oxygen sensors located after the catalytic converter tbh so no upstream and down would. Cases, a cold air intake actually provides a decent horsepower boost for a investment... Our member submitted drives over the years has been superb is unlikely both O2 sensor white! 1.6L M13A M16A gases both per/post catalyst consent for the money it to idle not having ordered the. On the 98-02 fbodies experience problems to idle and have not been classified into category! Order to determine if it is functioning correctly the source dealer,.! Posts with unbelievable performance for the universal rear one content exiting the catalytic converter $...

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