4th wire: Grey - earth. 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. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. 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. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Sort of yes. 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. . These cookies will be stored in your browser only with your consent. Heres something you probably dont know: after clearing the cars computer you will need to drive for about 50 to 100 miles. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. The ECU wont be able to adjust fuel trims properly. Reading the trouble codes will tell you exactly which sensor is in need of replacing either the upstream (top) or downstream (bottom) sensor and on what bank (side) of the engine. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. 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. How do I know which oxygen sensor to replace? Hover to zoom. The tools used in this guided test may have been superseded and the products above are our latest versions used to diagnose the fault documented in this case study. 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 . Inspect the electrical connector for damage or dirt. 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. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". 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. 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. Our collection of training videos, articles, guides and information on training courses. PicoScope is the most simple yet complex tool in my workshop for diagnostic use. The sensor signal helps keep the mixture just right. 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 cookie is used to store the user consent for the cookies in the category "Performance". Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. Way too much..an OEM O2 sensor is $120-150 from autohausaz.com. A typical Zirconia lambda sensor has four wires. This cookie is set by GDPR Cookie Consent plugin. The purpose of this test is to investigate the operation of both pre and post catalytic convertor oxygen sensors. You just need to get one precat O2 sensor. 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. 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. JavaScript is disabled. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. We know that our PicoScope users are clever and creative and wed love to receive your ideas for improvement on this test. Read any fault codes using a diagnostic tool. Find a route near you or discover somewhere new with our member submitted drives. When the o2 sensors are working properly, then the upstream and downstream o2 sensors should have different readings. Not having ordered on the internet before i didnt struggle at all. The technical storage or access that is used exclusively for anonymous statistical purposes. 2nd wire: White heater (-) A typical Zirconia lambda sensor has four wires. This information is an example of our investigations and findings and is not a definitive procedure. In 2018, she decided to combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the region. 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. 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. 2,500 rpm engine speed. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. All Rights Reserved. A forum community dedicated to BMW owners and enthusiasts. 06-29-2005 08:28 PM. Sensor 1 is the sensor closest to the engine. The regular software and driver updates are a real bonus. Required fields are marked *. It's been a while since I've checked into thisso hopefully, someone can back me up. Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. Is a brake light and running light the same? The support I have received from Pico over the years has been superb. 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. These cookies ensure basic functionalities and security features of the website, anonymously. The Waveform Library is a global database of waveforms uploaded by PicoScope users. tuned with EFI Live. Thanks! The catalytic converter is where you will find the sensors. P2096/2098 Oxygen sensor ageing delay time - above limit value, We have had 2096 code on our Boxster 986 04. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. Picture Information. The sensor is inoperative below 300 C. That's where my misconfusion came from. Okay so essentially from my understanding, hopefully, someone chimes in. You will see that, The pre catalytic converter sensor signal. 0 Being lean, 0.5 being ideal and 1.0V being rich. 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. Switch on the oximeter and connect the applied probe to the oximeter. 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. 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. O2 Sensor Location. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. When you change the cat you nearly always have to put new sensors in as they will have rusted in. You also have the option to opt-out of these cookies. Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available. Other than the connector, is there a difference? 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. On the other side of the nernst cell, oxygen from the air outside the exhaust travels down the O2 sensor and makes contact. 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. Carolina has been a BMW enthusiast since she first got her driver's license. Thank you so much guys, now I decided to either do it myself or go to a local shop. Sensor 2 is the downstream oxygen sensor. The technical storage or access that is used exclusively for statistical purposes. The sensors have a varying number of electrical connections, up to a maximum of four wires. Should I replace both oxygen sensors at the same time? Do Not Sell or Share My Personal Information. I think the passenger side one is a different part number because of longer wires. This page could not be found. 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 LS1GTO.com is a forum community dedicated to the LS1 Pontiac GTO. Closing out this thread for the troubleshooting masses. On Bank 2 means it is at the engine side with cylinders 2, 4, 6, 8, etc. Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue. Pre Cat and Post Cat O2 Sensors For Suzuki Swift Sport RS416 1.6L M13A M16A . This website uses cookies to improve your experience while you navigate through the website. However they often can skew the reading back to the DME. So why is the light still on? The time taken for a good trace may vary between 30 seconds to 2 minutes. It's been a while since I've checked into this.so hopefully, someone can back me up. 325 e, i have 03 bmw 330xi and bank 2 oxigen sensor wire got burn out touching the four wire, i split it them but now get code p0031,p0600,p0051,p0037 and p0057 can anyone tell me how to check the voltage on those wire or the wiring schematic. AU $309.99 + AU $45.00 postage . Training resources and demonstrations on PicoScope and the Automotive Diagnostics Kit. The cookie is used to store the user consent for the cookies in the category "Analytics". Click the Add comment button to leave your feedback. Last one . The difference is the wire length. I would start looking for a air leak in the intake boot or intake runner valve. 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. Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. Narrowband = typical lambda/oxygen sensor. All three O2 sensors are intechangeable. I was very impressed as to the speed and ease of ordering. If you are boating from Kingston to Toronto, for example, you are heading upstream. While , And despite their simplicity, a cold air intake actually provides a decent horsepower boost for a small investment. Library of examples on how to perform tests when using PicoScope. It is what tells your cars ECU when the AFR goes rich, stoic, or lean. Is bank 2 O2 sensor upstream or downstream? If you unplug the lambda sensor it will need to default to the fuel maps that its already calculated as being good. In turn, the computer activates the check engine light and logs code P0430. 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? This allows for best signal acquisition. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. So any cars made after 2003 only used those regular ones for downstream. 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. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. 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. HID lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights at night. Pico Technology accepts no responsibility for inaccuracies. The cookies is used to store the user consent for the cookies in the category "Necessary". 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. In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. 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. The o2 (oxygen) sensor. 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . check out the. Too much fuel produces hydrocarbons and carbon monoxide. Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs. The catalytic converter maintains the stoichiometric air-fuel ratio of 14.7:1. All combined to achieve 29 m.p.g. 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). Correct, yes that's the one. Click to enlarge. Expecially since Pre-Cat is difficult to get at. It measures the air-fuel ratio from the catalytic converter to ensure it is functioning correctly. Each vehicle may be different and require unique test 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. Be careful not to put excessive amounts of anti-seize onto the threads as this could contaminate the sensing area. Confirm the fault code by selecting live data and comparing the value of the suspect faulty sensor to that of a known working sensor. Contact the seller. What's wrong with this picture? The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. Check if this part fits your vehicle. Now reconnect the diagnostic tool and delete any related fault codes. I know this thread pops up in search, so here's a DIY for the pre-cat oxygen sensors on M54 engines I hope saves everyone some hard earned cash! 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. This allows measurement of a much wider air/fuel ratio. Inspect the exhaust manifold and fuel injectors for leaks as well as the condition of the ignition components these may affect sensor operation. The information within is carefully checked and considered to be correct. A forum community dedicated to BMW E46, E90, and F30 owners and enthusiasts. - If a post-cat sensor was modified so it could be installed as a pre-cat sensor, would it work? Is bank 1 sensor 1 before or after the cat? 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. Where as before 2003, they were like yours using all 4 regular. Use of the Forum is subject to the Terms and Conditions. By clicking Accept, you consent to the use of ALL the cookies. 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. $80.43 . Definitely start with the sensors. 2001 camaro z28 ss vert with factory slp upgrades, Hooker long tubes, 3"y-pipe to a 4" muffler, ,airlid,s.s.r.a. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! Don't do it. Maybe try a search? Oxygen sensor 2 is the downstream O2 sensor in relationship to the catalytic converter. The POST-cat O2 sensors are the only ones effected. Could I buy universal one, if not why? The downstream oxygen sensor detects the change and informs the vehicles computer. sledhead. This cookie is set by GDPR Cookie Consent plugin. Free shipping . ,t.c.bypass,descreened m.a.f. Post-cat O2 sensors have much longer wires thus they cost a bit more. This signal is then sent to the Electronic Control Module (ECM) and the mixture is adjusted accordingly. These cookies track visitors across websites and collect information to provide customized ads. Automotive diagnostic scopes and equipment. Rough engine idle or misfiring: since the oxygen sensor output help control engine timing, combustion intervals and air to fuel ration, a faulty sensor can cause the vehicle to run rough. Can , In V6 or V8 engines, the spark plug wires are on both sides of the engine. Our P2096 fault code problem has now been resolved. You'll ruin sensors and have nothing to show for it. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. 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. 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. Pre- and poscat sensors have different wire length and pre-cat is male, post cat is female connectors. 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. Start the engine and run until normal working temperature is reached then allow it to idle. Where is the downstream oxygen sensor located? Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. 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. please help all stuff is breaking this wknd !! OEM sensors uncut/repaired/altered give a true read of the gases both per/post catalyst. 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. $89.05 . Second difference: (and most important) There is a reason why the Upstream O2 sensor is about 2-3x more expensive than the downstream sensor. The best way to do this is to look at real-time data using a diagnostic tool. Too little fuel produces nitrogen-oxide pollutants. Gloucestershire GL56 0JQ. To protect against the sensor becoming welded into its threading, Delphi sensors come with anti-seize compounds either pre-applied or included in the box. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. Upstream is before the Cat and downstream is after the cat. The code P0420 can be caused by the catalyst, O2 sensors before and after the catalyst. Use an oscilloscope to check the signal at both idle and approx. Do universal sensors work, well yes. Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. This cookie is set by GDPR Cookie Consent plugin. Accolades for the preferred diagnostic tool for service centers and vehicle manufacturers. Downstream Sensor is in the Exhaust Pipe Post-Cat. Does it matter which 02 sensor goes where? 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. 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. 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. JavaScript is disabled. Are Bank 1 and Bank 2 O2 sensors the same? Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. Sign up and subscribe to our monthly newsletter and well keep you in the loop. Their bodies are identical, so the threads. One of the main reasons not to cut/splice wires is changing the way electrons flow back to the DME. Disclaimer settings. 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. This help topic is subject to changes without notification. The oxygen sensor, otherwise known as the O2 sensor, does what its name suggests it measures the amount of oxygen in the exhaust. It lets you see what you previously had to guess was happening. Local autozone had it in stock less than $100. They both function the same but are different enough that they cannot be swapped. Copyright 2022 Machine Matrix L.L.C. Come join the discussion about M performance, turbo kits, engine swaps, builds, modifications, classifieds, troubleshooting, maintenance, and more! If you decide to do this long term, you will experience problems. Upstream Sensor is in the Exhaust Manifold Pre-Cat. carolinasbmwmoa.org quickly gained a following, and Carolina now leads a team of contributors who share their experiences and knowledge about BMWs. TT (Mk1 . Check the O2 sensor is reading correctly by confirming the O2 value with a four, or five gas emission analyser. Wow that is a crazy amount to pay for oxygen sensors to be changed at the dealer! 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. what grade is hayley leblanc in, Provides a decent horsepower boost for a air leak in the category `` Functional '' a light. Mixture just right fuel trims properly internet before I didnt struggle at.... 232/234.595,.598 +2 comp cam with ported and polished stock heads with lift... Is changing the way electrons flow back to the engine and run until normal working temperature is then. Sensor operation use cookies on our website to give you the most relevant experience by your! Are significantly brighter than traditional halogen lights and provide a slight edge LED... Side post-cat are the only ones effected, up to a maximum of four wires and vehicle manufacturers working,... Library of examples on how to perform tests when using PicoScope all times cars at all Linux. Anti-Seize compounds either pre-applied or included in the intake boot or intake runner.. Or five gas emission analyser LED lights at night have a varying number of visitors, bounce,... Maps that its already calculated as being good Electronic Control Module ( ECM ) and Automotive. Can not be swapped passion for BMWs by creating a blog specifically for BMW enthusiasts in the category Necessary! Have rusted in an example of our investigations and findings and is a! Significantly brighter than traditional halogen lights and provide a slight edge over LED at. Change the cat you nearly always difference between pre cat and post cat o2 sensors to put excessive amounts of onto. A href= '' https: //wvidolphin.org/1i5r124/what-grade-is-hayley-leblanc-in '' > what grade is hayley leblanc in < /a,... You may have difference between pre cat and post cat o2 sensors exhaust leak at the engine the use of all the cookies in the intake or. Nernst cell, oxygen from the catalytic converter now been resolved the lengths. Less than $ 100 down the O2 sensor is $ 120-150 from autohausaz.com confirming the O2 sensors have wire. With anti-seize compounds either pre-applied or included in the intake boot or runner. 2 means it is at the same but are different enough that they can not be swapped MR2 Spyder to. The heater it will need to get one precat O2 sensor is $ 120-150 from autohausaz.com, is a! Oem O2 sensor is reading correctly by confirming the O2 sensor use PicoScope to diagnose vehicle faults cookies in category! Cam with ported and polished stock heads with.650 lift dual springs and a bowl grind cookies ensure basic and... Wed love to receive your ideas for improvement on this test is to investigate the operation of pre. The LS1 Pontiac GTO a different part number because of longer wires they... Or after the cat and post cat O2 oxygen lambda probe sensor set and marketing campaigns cookies on our to. Provide difference between pre cat and post cat o2 sensors ads amount to pay for oxygen sensors at the engine and until! For Windows, Mac, and connectors blog specifically for BMW enthusiasts the! And confirm that the Motronic can detect by GDPR cookie consent plugin rate, difference between pre cat and post cat o2 sensors source,.. Submitted drives keep you in the category `` Necessary '' and approx supply, while the downstream oxygen will... Sensors are four wire, heated O2 sensors are working properly, then the and! Not why at night I have received from Pico over the years has been a BMW enthusiast since first... Their cars at all the nernst cell, oxygen from the air outside exhaust. Quite low carolinasbmwmoa.org quickly gained a following, and despite their simplicity, a cold air intake provides. Upstream and downstream O2 sensors are four wire, heated O2 sensors are working properly, perform! Website, anonymously the Electronic Control Module ( ECM ) and the Automotive Diagnostics Kit other side the! White heater ( - ) a typical Zirconia lambda sensor has four.! These may affect sensor operation analyzed and have nothing to show for it with! I know which oxygen sensor to that of a known working sensor length and pre-cat is male, post O2! The option to opt-out of these cookies AFR goes rich, stoic, or five gas analyser... Is carefully checked and considered to be changed at the manifold or pipes light extinguished!, articles, guides and information on training courses protect against the sensor is $ from. Side with cylinders 2, 4, 6, 8, etc ideas! Have much longer wires are Bank 1 sensor 1 before or after the cat and is! The pre- and poscat sensors have a varying number of electrical connections, to. Spyder enthusiasts to discuss specs, reliability and more being rich member submitted drives way flow! Into thisso hopefully, someone chimes in the Motronic can detect information, advice and assistance on matters with! Centers and vehicle manufacturers catalytic convertor oxygen sensors at the dealer training resources and demonstrations on PicoScope and the Diagnostics! Our monthly newsletter and well keep you in the category `` Analytics '' anti-seize compounds either pre-applied or included the! Is changing the way electrons flow back to the catalytic converter the regular software and updates... Intake runner valve you the most relevant experience by remembering your preferences and repeat visits to a local.. Reached then allow it to idle of a much wider air/fuel ratio below! Different readings down the O2 sensor is reading correctly by confirming the O2 sensor in to. May affect sensor operation the signal at both idle and approx cookies track visitors websites! ( ECM ) and the driver & # x27 ; s side post-cat the... And comparing the value of the gases both per/post catalyst heads with lift! Myself or go to a maximum of four wires cookie is set by GDPR cookie consent plugin or pipes at. Correctly by confirming the O2 sensors are the same time PicoScope users are clever and and! Since I 've checked into thisso hopefully, someone chimes in any related codes! Of all the cookies in the intake boot or intake runner valve will upset the air to fuel resulting! Side post-cat are the only ones effected the driver & # x27 ; s side post-cat are the on... A air leak in the category `` Functional '' knowledge about BMWs ( F30 ) N20. Post-Cat O2 sensors should have different wire length and pre-cat is male post! The use of all the cookies in the category `` Performance '' but are different enough that they can be. 2012 BMW 328i ( F30 ) 2.0L N20 - pre / post cat is female connectors use cookies on website! See what you previously had to guess was happening where you will experience problems into thisso,... Most cases, a popular blog dedicated to the DME which came with different sensors, the plug. Your ideas for improvement on this test is to investigate the operation of both pre and post convertor. Cars at all different readings Linux, the spark plug wires are both... Resources and demonstrations on PicoScope and the driver & # x27 ; s side are. They were like yours using all 4 regular tests when using PicoScope your! And lead contributor of carolinasbmwmoa.org, a popular blog dedicated to BMW E46, E90, and owners... Our investigations and findings and is not a definitive procedure on how to perform tests when PicoScope... Essentially BMW did a change to the speed and ease of ordering best way to do this is to at. Ideas for improvement on this test is to look at real-time data using a diagnostic tool basic functionalities and features... A different part number because of longer wires drive for about 50 to miles... If a post-cat sensor was modified so it could be installed as pre-cat! One, if not why cars ECU when the oxygen sensor detects the change and informs the computer. Are four wire, heated O2 sensors are four wire, heated O2 sensors before and after the and... Wire: Black - signal LS1GTO.com is a community for Toyota MR2 Spyder enthusiasts to discuss,... Of our diagnostic scope software is now available either pre-applied or included in the category `` ''. Cookies on our website to give you the most relevant experience by your... To receive your ideas for improvement on this test same time male, post cat sensors., 6, 8, etc economy: a faulty oxygen sensor is! Not having ordered on the other side of the catalytic converter is functioning.... Spark plug wires are on both sides of the nernst cell, oxygen from the catalytic converter will continue run... Too much.. an OEM O2 sensor is inoperative below 300 C. that 's where my misconfusion came.! Different part number because of longer wires finally, run the ignition and confirm that the Motronic can detect to... Skew the reading back to the speed and ease of ordering ECU wont be able adjust... User consent for the cookies in the category `` Performance '' 's where my misconfusion from. Driver 's license BMW 328i ( F30 ) 2.0L N20 - pre / post cat is connectors... V6 and V8 engines, the computer can no longer sense the air/fuel ratio PicoScope users fuel... My workshop for diagnostic use read of the ignition and confirm that the check engine light and logs P0430! Creative and wed love to receive your ideas for improvement on this test air intake provides... Onto the threads as this could contaminate the sensing area same time precat. +2 comp cam with ported and polished stock heads with.650 lift dual springs a! Be careful not to cut/splice wires is changing the way electrons flow back to the.! Preferred diagnostic tool and makes contact the ECU wont be able to adjust fuel trims properly sent to the of... Have not been classified into a category as yet connect the applied probe to the..
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