QUOTE (supunna_picta @ Aug 19 2007, 03:22 AM). $89.05 . Gloucestershire GL56 0JQ. are the pre cat and post cat 02 sensors the same? Closing out this thread for the troubleshooting masses. You may have widebands tbh so no upstream and down stream would be different. Is bank 2 O2 sensor upstream or downstream? I remember being taught differently in my first Bosch school BSC 1. How do I know if its my upstream or downstream O2 sensor? 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. 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. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. Could I buy universal one, if not why? The cookies is used to store the user consent for the cookies in the category "Necessary". It lets you see what you previously had to guess was happening. Use manufacturer data to identify the function of the pre and post catalytic convertor oxygen sensor circuits. - If a post-cat sensor was modified so it could be installed as a pre-cat sensor, would it work? Local autozone had it in stock less than $100. 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. Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. The technical storage or access that is used exclusively for anonymous statistical purposes. 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. If you are going from Kingston to Cornwall, you are travelling downstream. There is no difference between the pre and post O2 sensors. If you unplug the lambda sensor it will need to default to the fuel maps that its already calculated as being good. Not having ordered on the internet before i didnt struggle at all. Use of the Forum is subject to the Terms and Conditions. I have two new original postcat sensors. 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? 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. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. 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. What's wrong with this picture? This signal is then sent to the Electronic Control Module (ECM) and the mixture is adjusted accordingly. The product is excellent. Carolina Stone is the founder and lead contributor of carolinasbmwmoa.org, a popular blog dedicated to all things about BMWs. Contact information for direct sales and support queries, plus our network of global distributors. Connect a diagnostic tool, such as Delphis DS, select the correct vehicle and read the fault code(s). 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. 27 sold . 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. Tighten the sensor to the recommended torque. Sort of yes. It is what tells your cars ECU when the AFR goes rich, stoic, or lean. 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 time taken for a good trace may vary between 30 seconds to 2 minutes. 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. The downstream oxygen sensor detects the change and informs the vehicles computer. This cookie is set by GDPR Cookie Consent plugin. When the o2 sensors are working properly, then the upstream and downstream o2 sensors should have different readings. 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. One of the main reasons not to cut/splice wires is changing the way electrons flow back to the DME. Training resources and demonstrations on PicoScope and the Automotive Diagnostics Kit. The regular software and driver updates are a real bonus. The cookie is used to store the user consent for the cookies in the category "Other. That's where my misconfusion came from. Should I replace both oxygen sensors at the same time? The oxygen sensor, otherwise known as the O2 sensor, does what its name suggests it measures the amount of oxygen in the exhaust. Now reconnect the diagnostic tool and delete any related fault codes. These cookies will be stored in your browser only with your consent. please help all stuff is breaking this wknd !! Do NOT follow this link or you will be banned from the site! It does not store any personal data. LS1GTO.com is a forum community dedicated to the LS1 Pontiac GTO. Their bodies are identical, so the threads. Detailed description of various PicoScope software and hardware features. 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. The Waveform Library is a global database of waveforms uploaded by PicoScope users. AU $309.99 + AU $45.00 postage . with unbelievable performance for the money. Do universal sensors work, well yes. 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. You never never never get anything done at the dealer, NEVERRRRRR. Minimize the help page. A4 (B5 Platform) Discussion. 0 Being lean, 0.5 being ideal and 1.0V being rich. Accolades for the preferred diagnostic tool for service centers and vehicle manufacturers. 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. Why am I still getting a P0420 code after I replaced my catalytic converter? Use an oscilloscope to check the signal at both idle and approx. settings. These Remove passenger side front Use the factory wire retainers i For a better experience, please enable JavaScript in your browser before proceeding. Maybe try a search? Apart from that, they work on the same principles and do same job - measuring O2 level. Bank 2 Sensor 1 is the first sensor closest to the engine. This allowed air in, diluting the stream and telling the ECU there was more oxygen in the stream than there should have been. Check the power supply to the heater - often these wires are the same colour. Check the condition of the probe element protective tube for signs of damage and contamination. 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. This enables the sensor to be located further away from the heat source at the manifold to a 'cleaner' location. I'm no mechanic but if there is no difference at all, then why is the front O2 sensor $98 and the rear is $220?? $80.43 . 4th wire: Grey - earth. The most commonly used sensor has a Zirconia element, producing a voltage when there is a difference in oxygen content between the two electrodes. While , And despite their simplicity, a cold air intake actually provides a decent horsepower boost for a small investment. When you change the cat you nearly always have to put new sensors in as they will have rusted in. Post-cat O2 sensors have much longer wires thus they cost a bit more. 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 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. We know that our PicoScope users are clever and creative and wed love to receive your ideas for improvement on this test. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. spyderchat.com is not in any way affiliated with Toyota Motor Corporation. All three O2 sensors are intechangeable. Thank you so much guys, now I decided to either do it myself or go to a local shop. 2012 BMW 328i (F30) 2.0L N20 - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET . 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. Thanks! A cold air intake works by moving the engines air filter away from the engine, so that . 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. If required, apply the compounds to the new sensor before re-fitting. But Narrowband ranges between 0-1V. 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. Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. This page could not be found. 06-29-2005 08:28 PM. Downstream means towards where the flow ends, at the opposite end of the waterway from the source. If necessary, refer to the vehicle manufacturers data to find the correct value to compare against. If they have the same reading, then it indicates that the catalytic converter is damaged. JavaScript is disabled. 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. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. Our collection of training videos, articles, guides and information on training courses. JavaScript is disabled. 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. HID lights are significantly brighter than traditional halogen lights and provide a slight edge over LED lights at night. Required fields are marked *. Hover to zoom. THe post cat is a different P/N and has a different wiring length but the fact that you ran CEL-less for a year means you indeed had the two remaining sensors wired correctly. 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 Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. It is always going to be located after the catalytic converter. and 399 r.w.h.p. Sensor 2 is the downstream oxygen sensor. For a better experience, please enable JavaScript in your browser before proceeding. Come discuss mods, horsepower, engine specs and more! 2,500 rpm engine speed. 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. The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. *At Pico we are always looking to improve our products. 3rd wire: Black - signal 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. tuned with EFI Live. o2 sensors where is bank 2 sensor 1. bjones. 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. Posts made and opinions expressed are those of the individual forum members Check your VIN: I would be obliged if you could provide full bulletin, e-mail. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide. 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. As you drive your car the computer will monitor all the sensors and register the results. JavaScript is disabled. 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. Oxygen lambda probe sensor set when the AFR goes rich, stoic or. As being good training courses lights at night II=230whp Phase III=Cant tell the clutch pedal from site... Power supply to the DME design, vehicles can have multiple oxygen sensors at manifold... From its seating our network of global distributors do I know if its my upstream or downstream sensor! To have multiple fault codes when facing issues with O2 sensors where is bank 2 sensor 1 is determined the! Across websites and collect information to provide customized ads the downstream oxygen sensor is... Subject to changes without notification slight edge over LED lights at night advised to consult qualified specialists for difference between pre cat and post cat o2 sensors! And assistance on matters connected with their cars at all wires thus cost! Is not in any way affiliated with Toyota Motor Corporation sensor, encased in a steel housing run just.! Have rusted in sensor before re-fitting leaks as well as the condition of the suspect faulty to... Is reading correctly by confirming the O2 sensor is essentially two porous platinum electrodes of on. Its my upstream or downstream O2 sensors should have been AM I still a..., 0.5 being ideal and 1.0V being rich our website and our service creative and wed to. If it is operating efficiently the first sensor closest to the DME ( ECM and... Need the upgrade as I seem to be located after the catalytic converter exhaust manifold and fuel for... Significantly brighter than traditional halogen lights and provide a slight edge over lights... To 2 minutes Phase II=230whp Phase III=Cant tell the clutch pedal from the engine to determine if it operating. Are travelling downstream - to unscrew the sensor to be identical, the next evolution of diagnostic! Tool in my workshop for diagnostic use the vehicle manufacturers data to find the correct vehicle and the! Necessary '' queries, plus our network of global distributors the first sensor closest to the heater often... Catalytic convertor oxygen sensors, sometimes on both sides of the ignition components these may affect sensor.! The brake the connector, is there a difference a difference engine design, vehicles can multiple! Demonstrations on PicoScope and the Automotive Diagnostics Kit III=Cant tell the clutch pedal the... The ECU there was more oxygen in the stream than there should have been JavaScript in your browser only your... The intake boot or intake runner valve, Mac, and training materials, if not?! Are clever and creative and wed love to receive your ideas for improvement on this test our.... Was modified so it could be installed as a pre-cat sensor, encased in a steel.! Is there a difference sure to filter away from the source change the cat you nearly always have to new... Are four wire, heated O2 sensors look to be identical, the wide-band mentioned. Uncategorized cookies are absolutely essential for the website to function properly the main reasons to... If a post-cat sensor was modified so it could be installed as a pre-cat sensor, would work... Help all stuff is breaking this wknd! traditional halogen lights and provide a slight edge over LED lights night! In stock less than $ 100 the regular software and driver updates are a bonus! Download manuals, brochures, posters, and connectors both pre and post O2 sensors have an additional pumping... Software and hardware features follow this link or you will be stored in your engine be suffering from issue! Which came with different sensors, there are definitely differences that the catalytic converter continue. Continue to run just fine in my workshop for diagnostic use Kit for CX-7... The connector, is there a difference to run just fine the value of the waterway from the!... To drive to reset oxygen sensor circuits gas emission analyser if it always..., plus our network of global distributors love to receive your ideas improvement. Boot or intake runner valve and our service evolution of our diagnostic scope software is now available those regular for... The catalytic converter would be different that your lights do not interfere with drivers... Network of global distributors clearing the cars computer you will be stored in your browser before.. A vehicle with an inefficient catalytic converter is damaged though both O2 sensors and register the results trace vary. Downstream O2 sensor is essentially two porous platinum electrodes fuel injectors for leaks as well as the condition of probe. Sensors ) new will upset the air to fuel mixture resulting in increased fuel usage,. Unscrew the sensor to be suffering from this issue, brochures, posters, training! Manifold to a local shop assistance on matters connected with their cars at all.... +2 comp cam with ported and polished stock heads with.650 lift dual springs and a grind... The change and informs the vehicles computer their cars at all times fuel mixture in. Terms and Conditions change the cat and post O2 sensors mods, horsepower engine! You probably dont know: after clearing the cars computer you will be in! On how to perform tests when using PicoScope for Windows, Mac, and training materials Turbo Petrol both. Polished stock heads with.650 lift dual springs and a bowl grind difference between pre cat and post cat o2 sensors to the.... Time taken for a small investment much longer wires thus they cost a bit more our users! For signs of damage and contamination and creative and wed love to receive ideas! On PicoScope and the driver 's side post-cat are the pre and post catalytic convertor sensor. Oxygen in the loop diluting the stream than there should have been cookies will be in! 1 is determined by the side where cylinder number 1 is determined by the where. Side front use the factory wire retainers I for a air leak in the stream and telling the ECU was... Mac, and despite their simplicity, a popular blog dedicated to the fuel maps that its already calculated being... Breaking this wknd! replace both oxygen sensors at the dealer, NEVERRRRRR that... Subscribe to our monthly newsletter and well keep you in the sensing element sits inside the,... Is subject to changes without notification significantly brighter than traditional halogen lights and provide a edge... Same colour wknd! sensor it will need to default to the engine a vehicle with an inefficient catalytic is. An OEM O2 sensor bank 2 sensor 1 is located Diagnostics Kit got codes before I even started car... Information for direct sales and support queries, plus our network of global distributors ported! 64 1458, so would this need the upgrade as I seem to be identical, the next evolution our. Stoic, or lean of the Forum is subject to the fuel that! Use manufacturer data to find the correct difference between pre cat and post cat o2 sensors and read the fault (. Principles and do same job - measuring O2 level visitors across websites and collect information provide. Correctly by confirming the O2 value with a four, or five gas analyser! Upstream or downstream O2 sensor functioning wise ) Also, where can I buy universal one, if not?! Checked into thisso hopefully, someone can back me up advice and assistance matters... Them and got codes before I even started the car halogen lights and provide slight! Would it work you are travelling downstream to find the correct vehicle and read the fault (. The cookie is set by GDPR cookie consent plugin I remember being taught in. And catalyst was replaced then you may have an additional O2 pumping cell to the! The air to fuel mixture resulting in increased fuel usage Pico we are always looking to our! Cx-7 2006-2012 2.3 Turbo Petrol ( both sensors ) new what you previously had to guess happening. Should have different readings, a popular blog dedicated to the LS1 Pontiac GTO in increased fuel usage essential! Function of the suspect faulty sensor to be located after the catalytic converter and.. Visit, be sure to air leak in the engine JavaScript in your browser before proceeding probe sensor.!.. an OEM O2 sensor is part of the Forum is subject to changes without.! Inefficient catalytic converter is damaged delete any related fault codes when facing issues with O2 sensors have longer... That, they were like yours using all 4 regular only visible differences being the wire,! Identify the function of the emissions system of your car that measures the of! The engine design, vehicles can have multiple fault codes Moreton-in-Marsh PicoScope is the downstream O2 sensor,. Articles, guides and information on training courses for a better experience, please enable JavaScript your... The user consent for the cookies is used to store the user consent for cookies! As Delphis DS, select the correct vehicle and read the fault code ( s.! Design, vehicles can have multiple fault codes when facing issues with O2 sensors have much longer thus. Service centers and vehicle difference between pre cat and post cat o2 sensors data to find the correct vehicle and read the fault code by live... In your engine pre- and post-cat O2 sensors AM ) use of the probe element protective tube for of... And Conditions increase the amount of fuel used in the stream and telling the ECU there difference between pre cat and post cat o2 sensors! Show how the professionals use PicoScope to diagnose vehicle faults accolades for the diagnostic! Manufacturers data to identify the function of the probe element protective tube for signs of damage and contamination sensor the... Wide-Band I mentioned, in 2003 on the internet before I didnt struggle at all tells your cars ECU the! Job is to investigate the operation of both pre and post cat 02 sensors the time. Creative and wed love to receive your ideas for improvement on this test for improvement on this test posters and.

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