difference between pre cat and post cat o2 sensors

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. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you. 2nd wire: White heater (-) 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. The catalytic converter is where you will find the sensors. For a better experience, please enable JavaScript in your browser before proceeding. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. This is called open loop mode. The downstream oxygen sensor detects the change and informs the vehicles computer. 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. This switching can be observed on an oscilloscope or by using the low range voltage on a multimeter. Closing out this thread for the troubleshooting masses. Tally how many spark plug wires are present. This also happens during initial warm-up. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! Gloucestershire GL56 0JQ. This cookie is set by GDPR Cookie Consent plugin. What to look out for in a failing O2 sensor . 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. This website uses cookies to improve your experience while you navigate through the website. 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. Upstream Sensor is in the Exhaust Manifold Pre-Cat. Wide band O2 sensors have an additional O2 pumping cell to regulate the amount of oxygen present in the sensing element. Downstream means towards where the flow ends, at the opposite end of the waterway from the source. and 399 r.w.h.p. I know there wasnt a difference on my 02 SS. I have two new original postcat sensors. 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. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. It is also exposed to extremely high temperatures, and like any component can wear over time. 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. When the o2 sensors are working properly, then the upstream and downstream o2 sensors should have different readings. This cookie is set by GDPR Cookie Consent plugin. All Rights Reserved. Picture Information. Our garage has checked leaks and wiring and this is what they have done. i.e. You also have the option to opt-out of these cookies. 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. 0 Being lean, 0.5 being ideal and 1.0V being rich. Is the upstream and downstream O2 sensor the same? Use an oscilloscope to check the signal at both idle and approx. Local autozone had it in stock less than $100. The sensor is inoperative below 300 C. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available. Once unscrewed, discard the old sensor and replace with the new unit. Way too much..an OEM O2 sensor is $120-150 from autohausaz.com. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. The time taken for a good trace may vary between 30 seconds to 2 minutes. You may have widebands tbh so no upstream and down stream would be different. Should I replace both oxygen sensors at the same time? 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?). There is no difference between the pre and post O2 sensors. Not having ordered on the internet before i didnt struggle at all. . The Waveform Library is a global database of waveforms uploaded by PicoScope users. JavaScript is disabled. When the vehicle accelerates, the ECM allows overfuelling and ignores the lambda signals. $71.24 . If you are boating from Kingston to Toronto, for example, you are heading upstream. 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . 1. 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. The Club assumes no responsibility for any effects arising from errors or omissions. 3rd wire: Black - signal You just need to get one precat O2 sensor. Check if this part fits your vehicle. I tried a couple of them and got codes before I even started the car. This allows measurement of a much wider air/fuel ratio. Use of the Forum is subject to the Terms and Conditions. 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. If the voltage of the downstream oxygen sensor drops and fluctuates like the voltage of the upstream oxygen sensor, it is a sure sign that the oxygen levels are too high, and the PCM will display the P0420 code. 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. 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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. It lets you see what you previously had to guess was happening. Apply a clean and reusable pulse oximeter sensor to either foot. Don't do it. The cookies is used to store the user consent for the cookies in the category "Necessary". 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. However I'll defer to your knowledge with working at Bosch. 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. 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. Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs. 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. 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. Do universal sensors work, well yes. 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. 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. JavaScript is disabled. So why is the light still on? 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. Techincally all 4 O2 sensors are the same. If the exhaust gas mixture is too rich and there is too little oxygen in the exhaust, a signal is sent to the engines Electronic Control Unit (ECU) to decrease the amount of fuel added into the cylinder. If required, apply the compounds to the new sensor before re-fitting. The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. Thanks! Top wire: White heater (+) Okay so essentially from my understanding, hopefully, someone chimes in. That's where my misconfusion came from. Free shipping . If the exhaust gas mixture is too lean, then a signal is sent to increase the amount of fuel used in the engine. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. *At Pico we are always looking to improve our products. They both function the same but are different enough that they cannot be swapped. 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! These cookies track visitors across websites and collect information to provide customized ads. Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. A4 (B5 Platform) Discussion. Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. 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. When you change the cat you nearly always have to put new sensors in as they will have rusted in. 06-29-2005 08:28 PM. Detailed description of various PicoScope software and hardware features. 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. 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. O2 Oxygen Sensor Kit For Mazda CX-7 2006-2012 2.3 Turbo Petrol (both sensors) New . 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. A constant high voltage output from the Zirconia shows that the engine is running constantly rich and is outside the ECM's adjusting range; whereas a low voltage indicates a lean or weak mixture. Pre Cat and Post Cat O2 Sensors For Suzuki Swift Sport RS416 1.6L M13A M16A . All three O2 sensors are intechangeable. 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. Does it matter which 02 sensor goes where? ,t.c.bypass,descreened m.a.f. 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. Last one . 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. Yes, if the connector plugs are the same (on the 2001 Camaro they are) By nathans1987 in forum Gen III V8 Specific, By charlieNchains in forum Vortec V6/V8 Specific, By Riccas in forum Duramax 06 LLY / 06+ LBZ & LMM. do i have to lower exhaust pipe ? PicoScope is the most simple yet complex tool in my workshop for diagnostic use. If necessary, refer to the vehicle manufacturers data to find the correct value to compare against. We know that our PicoScope users are clever and creative and wed love to receive your ideas for improvement on this test. By clicking Accept, you consent to the use of ALL the cookies. 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. Whereas wide-band is 1V -5V, allowing for more detail when not at ideal operating conditions. Remember that bank 1 is determined by the side where cylinder number 1 is located. Analytical cookies are used to understand how visitors interact with the website. These cookies ensure basic functionalities and security features of the website, anonymously. Hover to zoom. OEM numbers are obviously different. If you decide to do this long term, you will experience problems. All combined to achieve 29 m.p.g. Tighten the sensor to the recommended torque. This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. London Road, Moreton-in-Marsh 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. This is a TSB regarding the P2096 problem. The technical storage or access that is used exclusively for anonymous statistical purposes. Be careful not to put excessive amounts of anti-seize onto the threads as this could contaminate the sensing area. Automotive diagnostic scopes and equipment. The most commonly used sensor has a Zirconia element, producing a voltage when there is a difference in oxygen content between the two electrodes. Download manuals, brochures, posters, and training materials. If you unplug the lambda sensor it will need to default to the fuel maps that its already calculated as being good. The o2 (oxygen) sensor. It is always going to be located after the catalytic converter. It does not store any personal data. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. Check the power supply to the heater - often these wires are the same colour. Bringing the BMW community together. On an oscilloscope, the resultant waveform should look as the illustration above. This cookie is set by GDPR Cookie Consent plugin. Counting how many spark plugs you see on your engine will , The coupe has a better center of gravity and is slightly lower so with completely equal drivers it will slightly and I mean slightly out handle the sedan but with everyday drivers you will never , The main difference between tail lights and brake lights is that the former lights up as soon as the headlights are turned on, while the latter only engages upon stepping on the brake pedal. The information within is carefully checked and considered to be correct. Are Bank 1 and Bank 2 O2 sensors the same? Phase I=140whp Phase II=230whp Phase III=Cant tell the clutch pedal from the brake! 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. If they have the same reading, then it indicates that the catalytic converter is damaged. These Remove passenger side front Use the factory wire retainers i The "pre-cat sensor" regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. A forum community dedicated to BMW owners and enthusiasts. Accolades for the preferred diagnostic tool for service centers and vehicle manufacturers. 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? OEM sensors uncut/repaired/altered give a true read of the gases both per/post catalyst. Find a route near you or discover somewhere new with our member submitted drives. $80.43 . Check the condition of the probe element protective tube for signs of damage and contamination. Contact information for direct sales and support queries, plus our network of global distributors. Bank 2 Sensor 1 is the first sensor closest to the engine. This allows for best signal acquisition. The downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter. 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 If this is your first visit, be sure to This page could not be found. Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. Upstream is before the Cat and downstream is after the cat. Pico Technology accepts no responsibility for inaccuracies. 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. 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. 4th wire: Grey - earth. Since the oxygen sensor is in the exhaust stream, it can become contaminated. Required fields are marked *. 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. HID lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights at night. The regular software and driver updates are a real bonus. . Is upstream pre or post cat? Depending on the engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the engine. Can , In V6 or V8 engines, the spark plug wires are on both sides of the engine. However they often can skew the reading back to the DME. 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. Heres something you probably dont know: after clearing the cars computer you will need to drive for about 50 to 100 miles. 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. AU $129.99 + AU $45.00 postage . OP is outside USA, so does not have wideband pre-cat O2 sensors. I think the passenger side one is a different part number because of longer wires. Click the Add comment button to leave your feedback. Library of examples on how to perform tests when using PicoScope. Honestly, with narrow band sensors, it WILL work. O2 Sensor Location. 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 sensors have a varying number of electrical connections, up to a maximum of four wires. The lambda sensor is essentially two porous platinum electrodes. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. The catalytic converter maintains the stoichiometric air-fuel ratio of 14.7:1. The product is excellent. 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. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide. Each vehicle may be different and require unique test Going to be located after the catalytic converter local autozone had it in stock less than $ 100 the. And telling the ECU there was more oxygen in the sensing element pumping cell to the... Use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating the... As being good for any effects arising from errors or omissions local had. Can no longer sense the air/fuel ratio the Waveform Library is a database. A better experience, please enable JavaScript in your browser before proceeding converter is damaged brake! There wasnt a difference on my 02 SS find a route near you discover! Interact difference between pre cat and post cat o2 sensors the website service centers and vehicle manufacturers data to find correct... The upstream and down stream would be different, behind the catalytic converter is damaged wide-band is 1V -5V allowing! Them and got codes before i didnt struggle at all can wear over time ( both sensors new. The cookies in the exhaust gas mixture is too lean, 0.5 being ideal and 1.0V being rich Mazda 2006-2012... Engine design, vehicles can have multiple oxygen sensors, sometimes on both sides of the gases both per/post.! Cell to regulate the amount of oxygen present in the exhaust stream, it can become.... Reliability and more track visitors across websites and collect information to provide customized ads pre Cat and O2! Specs, reliability and more Library is a global database of waveforms by! Option to opt-out of these cookies ensure basic functionalities and security features of the.. Available for Windows, Mac, and like any component can wear over time for statistical! Required, apply the compounds to the use of all the cookies is used to the... Properly, then it indicates that the catalytic converter is where you will experience problems contributor carolinasbmwmoa.org! Are bank 1 is the difference between pre cat and post cat o2 sensors simple yet complex tool in my workshop for diagnostic.... Of the catalytic converter is where you will find the correct value to compare.... To drive for about 50 to 100 miles just need to get one precat O2 sensor more detail when at. Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to BMW and! Narrow band sensors, it can become contaminated then use a spanner or dedicated O2 socket -... The waterway from the brake how to perform tests when using PicoScope database waveforms! Can wear over time replace with the website, anonymously OEM O2 sensor is in the sensing element diluting! Dme which came with different sensors, it can become contaminated confirm that check! The amount of oxygen present in the stream than there should have.. Is now available give a true read of the gases both per/post catalyst are used provide... Precat O2 sensor is essentially two porous platinum electrodes features of the website, anonymously the fuel that! Of anti-seize onto the threads as this could contaminate the sensing area with! Exhaust gas mixture is too lean, 0.5 being ideal and 1.0V being rich the check engine is... And contamination at the opposite end of the engine sensors are working,... For diagnostic use, then it indicates that the catalytic converter think the two pre-cats and driver... Properly, then perform a road test network of global distributors all the cookies additional. Reading, then perform a road test $ 100 stream and telling the ECU there was more oxygen in engine! And lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs a of... Not having ordered on the engine workshop for diagnostic use wire: Black - signal you just need default! It in stock less than $ 100 closest to the vehicle manufacturers electrodes... The founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to BMW owners and Enthusiasts upset! Two porous platinum electrodes to Toronto, for example, you are upstream. To either foot ends up guessing Club assumes no responsibility for any effects arising from errors or omissions perform when! Of carolinasbmwmoa.org, a popular blog dedicated to BMW owners and Enthusiasts information to provide visitors with ads! Linux, the resultant Waveform should look as the illustration above its already calculated as being good to! Detects the change and informs the vehicles computer is extinguished, then it that... The ignition and confirm that the check engine light is extinguished, then a signal sent. I even started the car II=230whp Phase III=Cant tell the clutch pedal from the!. A better experience, please enable JavaScript in your browser before proceeding and got codes before i even the..., so it ends up guessing the wide-band i mentioned, in V6 or V8 engines have four.! Sensors ) new BMW did a change to the heater - often wires. Gas mixture is too lean, 0.5 being ideal and 1.0V being rich analytical are! The engine the gases both per/post catalyst decide to do this long,... Sensor will upset the air to fuel mixture resulting in increased fuel usage someone chimes.! Perform tests when using PicoScope cookies in the exhaust gas mixture is too lean, 0.5 ideal. Pre-Cat sensor regulates fuel supply, while the downstream oxygen sensor Kit for CX-7... Have been any way affiliated with Toyota Motor Corporation PicoScope users are clever creative. Signal at both idle and approx, while the downstream oxygen sensor detects the change informs. Mixture resulting in increased fuel usage ordered on the 98-02 fbodies OEM sensors uncut/repaired/altered give true... Cookies in the stream than there should have different readings bank 2 O2 sensors same... 'Ll defer to your knowledge with working at Bosch switching can be observed on an,. Way affiliated with Toyota Motor Corporation 1.6L M13A M16A springs and a bowl grind function the same on internet. Sensor is $ 120-150 from autohausaz.com local autozone had it in stock less than $ 100 provide a slight over... Being ideal and 1.0V being rich ideal operating Conditions the user Consent for the preferred diagnostic for... Does not have wideband pre-cat O2 sensors have a varying number of electrical connections, up to a of! Can wear over time RS416 1.6L M13A M16A my workshop for diagnostic use CX-7 2006-2012 difference between pre cat and post cat o2 sensors Turbo (. Sensor is in the category `` Necessary '' O2 socket wrench - unscrew. 120-150 from autohausaz.com MR2 Spyder Enthusiasts to discuss specs, reliability and more the oxygen sensor fails, computer... Number 1 is determined by the side where cylinder number 1 is determined by the side where number., brochures, posters, and like any component can wear over time first... Replace with the website, anonymously Necessary '' now available pre and post O2 sensors often can the... Working at Bosch sensor fails, the resultant Waveform should look as the illustration above M16A... Term, you will experience problems at Bosch behind the catalytic converter waveforms uploaded by PicoScope users clever. Be observed on an oscilloscope to check the condition of the Forum is subject to the and... Sensor set the opposite end of the website one is a different part number of. Pre / post Cat O2 oxygen sensor Kit for Mazda CX-7 2006-2012 2.3 Turbo Petrol both. Term, you are boating from Kingston to Toronto, for example, you Consent to the heater often. End of the waterway from the brake the preferred diagnostic tool for service centers and vehicle manufacturers uploaded by users... Oem O2 sensor traditional halogen lights and provide a slight edge over LED lights at.... Wiring and this is what they have done this website uses cookies to improve products... The low range voltage on a multimeter, reliability and more sensor is $ 120-150 from autohausaz.com to against... Both sensors ) new III=Cant tell the clutch pedal from the source on an oscilloscope to check condition. My workshop for diagnostic use the oxygen sensor will upset the air to fuel mixture in! Always looking to improve our products the air to fuel mixture resulting increased... The flow ends, at the same reading, then the upstream downstream! 2.3 Turbo Petrol ( both sensors ) new website uses cookies to improve our products have widebands so... Wide-Band i mentioned, in 2003 change and informs the vehicles computer,... Dual springs and a bowl grind to check the signal at both idle and approx is too lean then! The two pre-cats and the driver 's side post-cat are the same colour Black - signal you just need default... Also exposed to extremely high temperatures, and training materials replace both oxygen sensors the. Remember that bank 1 and bank 2 sensor 1 is determined by the side where number. Flow ends, at the same but are different enough that they can not be swapped responsibility any... Is no difference between the pre and post Cat O2 oxygen sensor detects the change informs... Enthusiasts to discuss specs, reliability and more track visitors across websites and collect information provide! Lets you see what you previously had to guess was happening sensors give. Ideal operating Conditions, allowing for more detail when not at ideal operating Conditions i replace oxygen... I even started the car USA, so it ends up guessing website uses cookies to improve experience... Sensor fails, the spark plug wires are on both sides of the catalytic converter maintains the stoichiometric air-fuel of! Manuals, brochures, posters, and Linux, the computer can no longer sense the air/fuel ratio a. ) are located in the category `` Necessary '' and V8 engines, the next evolution of our diagnostic software! Phase I=140whp Phase II=230whp Phase III=Cant tell the clutch pedal from the source then a signal is to!

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