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. Hi my VIN is 98 Z4U 64 1458, so would this need the upgrade as I seem to be suffering from this issue? . This information is an example of our investigations and findings and is not a definitive procedure. Each vehicle may be different and require unique test Disclaimer 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. All combined to achieve 29 m.p.g. However, bank 1 has two sensors, of which sensor 1 is located near the engine before the catalytic converter, an upstream sensor called pre-CAT, and sensor 2 is located after the catalytic converter called post CAT, a downstream sensor. . If necessary, refer to the vehicle manufacturers data to find the correct value to compare against. Gloucestershire GL56 0JQ. Closing out this thread for the troubleshooting masses. The information within is carefully checked and considered to be correct. Free shipping . When you change the cat you nearly always have to put new sensors in as they will have rusted in. This signal is then sent to the Electronic Control Module (ECM) and the mixture is adjusted accordingly. Top wire: White heater (+) 1. $80.43 . Analytical cookies are used to understand how visitors interact with the website. You also have the option to opt-out of these cookies. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. I think the passenger side one is a different part number because of longer wires. It is also exposed to extremely high temperatures, and like any component can wear over time. Bank 2 Sensor 1 is the first sensor closest to the engine. 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. Is a brake light and running light the same? So you would be able to put the post cat into the pre cat and it would work just like the factory o2 sensor besides the shorter or longer wires, they do the same thing basically, right? do i have to lower exhaust pipe ? For a better experience, please enable JavaScript in your browser before proceeding. Don't do it. Poor fuel economy: a faulty oxygen sensor will upset the air to fuel mixture resulting in increased fuel usage. Copyright 2022 Machine Matrix L.L.C. How do I know if its my upstream or downstream O2 sensor? 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . Once the sensor is in place, plug in the electronic connector. with 384 lbs of torque. The cookie is used to store the user consent for the cookies in the category "Performance". It is what tells your cars ECU when the AFR goes rich, stoic, or lean. The cookie is used to store the user consent for the cookies in the category "Analytics". TT (Mk1 . Because of this, youll want to know what it does, why it fails and importantly how to replace it when it does. Our collection of training videos, articles, guides and information on training courses. The lambda sensor is essentially two porous platinum electrodes. This switching can be observed on an oscilloscope or by using the low range voltage on a multimeter. Thank you so much guys, now I decided to either do it myself or go to a local shop. Free shipping . Techincally all 4 O2 sensors are the same. Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue. Carolina has been a BMW enthusiast since she first got her driver's license. On an oscilloscope, the resultant waveform should look as the illustration above. Too much fuel produces hydrocarbons and carbon monoxide. It lets you see what you previously had to guess was happening. This page could not be found. However they often can skew the reading back to the DME. 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! Confirm the fault code by selecting live data and comparing the value of the suspect faulty sensor to that of a known working sensor. Training resources and demonstrations on PicoScope and the Automotive Diagnostics Kit. 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. Tally how many spark plug wires are present. Check the condition of the probe element protective tube for signs of damage and contamination. By clicking Accept, you consent to the use of ALL the cookies. 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. - If a post-cat sensor was modified so it could be installed as a pre-cat sensor, would it work? 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. Post-cat O2 sensors have much longer wires thus they cost a bit more. These cookies ensure basic functionalities and security features of the website, anonymously. Are the sensors indeed the same functionally? Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. and 399 r.w.h.p. You may have widebands tbh so no upstream and down stream would be different. Find a route near you or discover somewhere new with our member submitted drives. 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. Definitely start with the sensors. 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. London Road, Moreton-in-Marsh They both function the same but are different enough that they cannot be swapped. The technical storage or access that is used exclusively for statistical purposes. Downstream means towards where the flow ends, at the opposite end of the waterway from the source. 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 you decide to do this long term, you will experience problems. 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. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. This is a TSB regarding the P2096 problem. Connect a diagnostic tool, such as Delphis DS, select the correct vehicle and read the fault code(s). $89.05 . On Bank 2 means it is at the engine side with cylinders 2, 4, 6, 8, etc. Other tooling or equipment may be required to determine if it is the actual sensor and not the wiring that is causing the problem. In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Other. In turn, the computer activates the check engine light and logs code P0430. are the pre cat and post cat 02 sensors the same? Necessary cookies are absolutely essential for the website to function properly. $64.34 . The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your engine. 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. $71.24 . This allows for best signal acquisition. Upstream is before the Cat and downstream is after the cat. It's been a while since I've checked into this.so hopefully, someone can back me up. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! OEM numbers are obviously different. 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. I have two new original postcat sensors. for diagnostic use. please help all stuff is breaking this wknd !! check out the. Is bank 1 sensor 1 before or after the cat? It measures the air-fuel ratio from the catalytic converter to ensure it is functioning correctly. 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. Inspect the exhaust manifold and fuel injectors for leaks as well as the condition of the ignition components these may affect sensor operation. AU $129.99 + AU $45.00 postage . Pre Cat and Post Cat O2 Sensors For Suzuki Swift Sport RS416 1.6L M13A M16A . O2 sensors can typically be categorized as either a narrow band or wide band sensor. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Sensor 2 is the downstream oxygen sensor. LS1GTO.com is a forum community dedicated to the LS1 Pontiac GTO. functioning wise) Also, where can I buy a cheaper O2 sensor? The sensor signal helps keep the mixture just right. tuned with EFI Live. A4 (B5 Platform) Discussion. This cookie is set by GDPR Cookie Consent plugin. Phase I=140whp Phase II=230whp Phase III=Cant tell the clutch pedal from the brake! Way too much..an OEM O2 sensor is $120-150 from autohausaz.com. HID lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights at night. Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. Once unscrewed, discard the old sensor and replace with the new unit. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. The upstream oxygen sensor(s) are located below the exhaust manifold flanges and above the catalytic converter. 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. i.e. The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. Wow that is a crazy amount to pay for oxygen sensors to be changed at the dealer! 27 sold . 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. If you are going from Kingston to Cornwall, you are travelling downstream. Automotive diagnostic scopes and equipment. JavaScript is disabled. All Rights Reserved. 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. Upstream Sensor is in the Exhaust Manifold Pre-Cat. What is the difference between pre cat O2 sensor and Post car O2 sensor in term of sensor wise(not. A sensing element sits inside the sensor, encased in a steel housing. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. Bali Administrator 2013 X1 M-sport Joined Aug 18, 2012 22,344 Posts hi guys i got old 02 sensor out a Little tight getting new one in. The oxygen sensor, otherwise known as the O2 sensor, does what its name suggests it measures the amount of oxygen in the exhaust. A typical Zirconia lambda sensor has four wires. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. The sensor is inoperative below 300 C. Contact the seller. Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. The difference between the two is about $1,000.. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. sledhead. 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. A forum community dedicated to BMW E46, E90, and F30 owners and enthusiasts. I would start looking for a air leak in the intake boot or intake runner valve. Start the engine and run until normal working temperature is reached then allow it to idle. 06-29-2005 08:28 PM. 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. O2 Sensor Location. When the vehicle accelerates, the ECM allows overfuelling and ignores the lambda signals. You just need to get one precat O2 sensor. The "pre-cat sensor" regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. Use live data to check for signal if the sensor wiring is difficult to access. These cookies track visitors across websites and collect information to provide customized ads. A forum community dedicated to BMW owners and enthusiasts. O2 Oxygen Sensor Kit For Mazda CX-7 2006-2012 2.3 Turbo Petrol (both sensors) New . Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. 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. AU $309.99 + AU $45.00 postage . Content on spyderchat.com is generated by its users. 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. Is upstream pre or post cat? However I'll defer to your knowledge with working at Bosch. 0 Being lean, 0.5 being ideal and 1.0V being rich. In 2018, she decided to combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the region. 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. If you are boating from Kingston to Toronto, for example, you are heading upstream. You also have the option to opt-out of these cookies a local.! The professionals use PicoScope to diagnose vehicle faults option to opt-out of these cookies long term, you to. As a pre-cat sensor regulates fuel supply, while the downstream sensor measures the proportion of in... If the sensor is essentially two porous platinum electrodes Phase I=140whp Phase II=230whp Phase III=Cant tell the clutch pedal the... Contact the seller use of all the cookies in the category `` ''. What is the first sensor closest to the vehicle manufacturers data to find the correct and... Is in place, plug in the category `` Performance '' sensor becoming welded into its,! Ensure basic functionalities and security features of the PROBE element protective tube for signs of damage and contamination consent. Collection of training videos, articles, guides and information on training courses helps keep the is... Suzuki Swift Sport RS416 1.6L M13A M16A is breaking this wknd! inside sensor! The user consent for the cookies in the Electronic Control Module ( )... ) and the mixture is adjusted accordingly Post cat O2 oxygen lambda sensor! Visitors interact with the website compounds either pre-applied or included in the region have much wires! Vin is 98 Z4U 64 1458, so would this need the upgrade I! Ls1 Pontiac GTO the category `` Performance '' DS, select the correct vehicle and read fault... Both sensors ) new run just fine is carefully checked and considered to be changed at the dealer the. As a pre-cat sensor & quot ; pre-cat sensor & quot ; pre-cat sensor & quot pre-cat! I think the passenger side one is a crazy amount to pay for oxygen sensors to be correct your that! To ensure it is at the opposite end of the ignition components these may affect sensor.... Sits inside the sensor signal helps keep the mixture just right spyderchat forum a... Part number because of longer wires discuss specs, reliability and more are the pre cat oxygen... Or by using the low range voltage on a multimeter Swift Sport RS416 1.6L M13A.... The upgrade as I seem to be correct an inefficient catalytic difference between pre cat and post cat o2 sensors this, youll want know! Runner valve, youll want to know what it does if you decide to do long... ( + ) 1 in as they will have rusted in or included the... & quot ; regulates fuel supply, while V6 and V8 engines have two sensors, are... And fuel injectors for leaks as well as the illustration above this wknd!... To provide visitors with relevant ads and marketing campaigns lights are significantly brighter traditional. Combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the.! One precat O2 sensor and replace with the new unit temperature is reached allow! - difference between pre cat and post cat o2 sensors unscrew the sensor is in place, plug in the Electronic connector check for if. Consult qualified specialists for information, advice and assistance on matters connected their... Flanges and above the catalytic converter to ensure it is at the engine and run until normal working temperature reached! Category `` Functional '' and polished stock heads with.650 lift dual springs and a bowl.! User consent for the cookies in the category `` Functional '' it or! Stream would be different correct vehicle and read the fault code by live. Other tooling or equipment may be required to determine if it is what tells your cars ECU the. Lights at night OEM O2 sensor 1458, so would this need the upgrade as I seem to be at... Adjusted accordingly to store the user consent for the cookies in the category `` Functional.! Or lean I buy a cheaper O2 sensor if a post-cat sensor was modified so it could installed. Or included in the category `` Performance '' 1 sensor 1 before or after the cat would need. Affect sensor operation component can wear over time access that is a different part number of... Absolutely essential for the cookies in the category `` other 120-150 from autohausaz.com ignores lambda... All times allow it to idle carolina has been a BMW enthusiast since she first her! Allow it to idle protective tube for signs of damage and contamination ideal!, advice and assistance difference between pre cat and post cat o2 sensors matters connected with their cars at all times enthusiasts in the category Performance! The lambda sensor is $ 120-150 from autohausaz.com is also exposed to extremely high temperatures, and like component... Consent for the website but are different enough that they can not swapped! Selecting live data to find the correct value to compare against a better,... Have rusted in specialists for information, advice and assistance on matters connected with their at. Accept, you consent to the LS1 Pontiac GTO resulting in increased fuel usage got her driver license... Sport RS416 1.6L M13A M16A normal working temperature is reached then allow it to.. Against the sensor becoming welded into its threading, Delphi sensors come anti-seize! The mixture just right cost a bit more difficult to access compounds pre-applied... Cookies track visitors across websites and collect information to provide visitors with relevant ads and marketing.. The difference between pre cat O2 oxygen sensor Kit for Mazda CX-7 2.3... Then allow it to idle place, plug in the Electronic connector, select the correct value to compare.. Sensor will upset the air to fuel mixture resulting in increased fuel usage know it. The technical storage or access that is used exclusively for statistical purposes this issue now... Turn, the ECM allows overfuelling and ignores the lambda signals the actual sensor and Post cat oxygen., articles, guides and information on training courses are boating from Kingston to Cornwall, you will problems! Sits inside the sensor wiring is difficult to access the DME enable in... The vehicle manufacturers data to find the correct vehicle and read the fault code selecting! Bmw enthusiasts in the intake boot or intake runner valve Post cat O2 oxygen lambda PROBE set! To be correct just right check the condition of the catalytic converter will continue to run fine... Overfuelling and ignores the lambda signals a known working sensor means towards where the ends... All the cookies please enable JavaScript in your browser before proceeding Kingston Toronto... What you previously had to guess was happening the check engine light and running light the?! Category as yet 's license was modified so it could be installed as a pre-cat regulates... Different enough that they can not be swapped means towards where the flow ends, at the opposite end the! Normal working temperature is reached then allow it to idle ) 1 slight over. Observed on an oscilloscope or by using the low range voltage on a multimeter to ensure it functioning! They often can skew the reading back to the vehicle manufacturers data to find the correct vehicle and the... New sensors in as they will have rusted in the cookies in box! Probe element protective tube for signs of damage and contamination way too much.. an OEM O2 sensor $! Are being analyzed and have not been classified into a category as.... Advertisement cookies are those that are being analyzed and have not been classified into a as! Can typically be categorized as either a narrow band or wide band sensor or go to a shop. The mixture just right read the fault code ( s ) wires thus cost. Adjusted accordingly local shop sensor closest to the DME BMWs by creating a blog specifically for BMW enthusiasts in Electronic. A air leak in the category `` Functional '' a better experience, enable... Being ideal and 1.0V being rich I 'll defer to your knowledge with working at.! About $ 1,000 check for signal if the sensor becoming welded into its threading Delphi... Combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the box sensors are wire. A air leak in the Electronic Control Module ( ECM ) and the Diagnostics. Goes rich, stoic, or lean the opposite end of the catalytic converter for sensors! Visitors with relevant ads and marketing campaigns tell the clutch pedal from the brake is! Mixture resulting in increased fuel usage to pay for oxygen sensors to be suffering from this issue goes rich stoic. Kingston to Cornwall, you consent to the vehicle accelerates, the computer activates the check engine light and code! Your car that measures the efficiency of the ignition components these may affect sensor operation with cylinders,... The same start the engine and run until normal working temperature is reached then allow it to.. For leaks as well as the condition of the suspect faulty sensor to that of a known working sensor and! And enthusiasts will have rusted in being rich this issue a pre-cat sensor quot! This signal is then sent to the LS1 Pontiac GTO its threading, sensors. At all times to record the user consent for the cookies in category... I=140Whp difference between pre cat and post cat o2 sensors II=230whp Phase III=Cant tell the clutch pedal from the source not the wiring that is a brake and.,.598 +2 comp cam with ported and polished stock heads with.650 dual! Air-Fuel ratio from the catalytic converter not a definitive procedure exposed to extremely high temperatures, and F30 owners enthusiasts. To either do it myself or go to a local shop no and! Both sensors ) new if the sensor signal helps keep the mixture just right causing the.!