difference between pre cat and post cat o2 sensors

The downstream oxygen sensor(s) are located in the exhaust pipe, behind the catalytic converter. It's been a while since I've checked into this.so hopefully, someone can back me up. Are Bank 1 and Bank 2 O2 sensors the same? Use of the Forum is subject to the Terms and Conditions. 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! 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. JavaScript is disabled. Is bank 2 O2 sensor upstream or downstream? are the pre cat and post cat 02 sensors the same? JavaScript is disabled. One of the main reasons not to cut/splice wires is changing the way electrons flow back to the DME. 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?? 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. Free shipping . Training resources and demonstrations on PicoScope and the Automotive Diagnostics Kit. Techincally all 4 O2 sensors are the same. Come join the discussion about M performance, turbo kits, engine swaps, builds, modifications, classifieds, troubleshooting, maintenance, and more! 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. . Okay so essentially from my understanding, hopefully, someone chimes in. Once unscrewed, discard the old sensor and replace with the new unit. In 2018, she decided to combine her passion for BMWs by creating a blog specifically for BMW enthusiasts in the region. This is due to the fact that bank 2 is representative of an engines #2 cylinder, while sensor 2 serves as a downstream designation. Why am I still getting a P0420 code after I replaced my catalytic converter? Connect a diagnostic tool, such as Delphis DS, select the correct vehicle and read the fault code(s). functioning wise) Also, where can I buy a cheaper O2 sensor? If you are boating from Kingston to Toronto, for example, you are heading upstream. A typical Zirconia lambda sensor has four wires. If you unplug the lambda sensor it will need to default to the fuel maps that its already calculated as being good. with 384 lbs of torque. Contact information for direct sales and support queries, plus our network of global distributors. 2012 AUDI A6 (C7) 2.0L CAEB - PRE / POST CAT O2 OXYGEN LAMBDA PROBE SENSOR SET-2 . Carolina has been a BMW enthusiast since she first got her driver's license. AU $309.99 + AU $45.00 postage . 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. If this is your first visit, be sure to Real-life case studies show how the professionals use PicoScope to diagnose vehicle faults. Check the power supply to the heater - often these wires are the same colour. All Rights Reserved. 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. 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. 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). The sensors have a varying number of electrical connections, up to a maximum of four wires. Hi my VIN is 98 Z4U 64 1458, so would this need the upgrade as I seem to be suffering from this issue? On an oscilloscope, the resultant waveform should look as the illustration above. Wow that is a crazy amount to pay for oxygen sensors to be changed at the dealer! In turn, the computer activates the check engine light and logs code P0430. Use live data to check for signal if the sensor wiring is difficult to access. Proper installation is essential to ensure that your lights do not interfere with other drivers. PicoScope is the most simple yet complex tool in my workshop for diagnostic use. AU $129.99 + AU $45.00 postage . These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. 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. Once the sensor is in place, plug in the electronic connector. The oxygen sensor, otherwise known as the O2 sensor, does what its name suggests it measures the amount of oxygen in the exhaust. If you're electrically competent. Wide band O2 sensors have an additional O2 pumping cell to regulate the amount of oxygen present in the sensing element. You never never never get anything done at the dealer, NEVERRRRRR. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. Does it matter which 02 sensor goes where? 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 !! Are the sensors indeed the same functionally? 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 . It is always going to be located after the catalytic converter. Tighten the sensor to the recommended torque. I know there wasnt a difference on my 02 SS. You also have the option to opt-out of these cookies. 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. The sensor signal helps keep the mixture just right. 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. Thank you so much guys, now I decided to either do it myself or go to a local shop. This signal is then sent to the Electronic Control Module (ECM) and the mixture is adjusted accordingly. Then use a spanner or dedicated O2 socket wrench - to unscrew the sensor from its seating. Finally, run the ignition and confirm that the check engine light is extinguished, then perform a road test. 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. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. The O2 sensor is part of the emissions system of your car that measures the proportion of oxygen in your engine. I tried a couple of them and got codes before I even started the car. Is bank 1 sensor 1 before or after the cat? Downstream means towards where the flow ends, at the opposite end of the waterway from the source. 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. Pico Technology accepts no responsibility for inaccuracies. Do Not Sell or Share My Personal Information. Lambda sensors have an internal heater, so check the resistance of the heater it will usually be quite low. This is called open loop mode. This help topic is subject to changes without notification. Too much fuel produces hydrocarbons and carbon monoxide. The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. 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. Bringing the BMW community together. For a better experience, please enable JavaScript in your browser before proceeding. Upstream is before the Cat and downstream is after the cat. The ECU wont be able to adjust fuel trims properly. 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. This enables the sensor to be located further away from the heat source at the manifold to a 'cleaner' location. This also happens during initial warm-up. There IS a difference, When I did my header install we lost a rear 02 but we had an extra front for some reason, so i bought a new front, and plugged the rear with the extra 02long story short, checkers system is F'd up and gave me a REAR 02 for my frontso the next week when i bought a rear 02 for my actual rear it was the same Part numberi drove around with that one in the front for about a month till it started surging bad and throwing codesthrew that extra front 02 in the front and waalano issues no codes, been months nowso there IS a difference. So essentially bmw did a change to the DME which came with different sensors, the wide-band I mentioned, in 2003. 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. The "pre-cat sensor" regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. How many miles do you have to drive to reset oxygen sensor? We know that our PicoScope users are clever and creative and wed love to receive your ideas for improvement on this test. 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. The pre-cat sensor regulates fuel supply, while the downstream sensor measures the efficiency of the catalytic converter. Hover to zoom. $71.24 . We also use third-party cookies that help us analyze and understand how you use this website. Top wire: White heater (+) settings. Library of examples on how to perform tests when using PicoScope. The technical storage or access that is used exclusively for anonymous statistical purposes. The most commonly used sensor has a Zirconia element, producing a voltage when there is a difference in oxygen content between the two electrodes. JavaScript is disabled. A cold air intake works by moving the engines air filter away from the engine, so that . The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes. Download manuals, brochures, posters, and training materials. Required fields are marked *. Be careful not to put excessive amounts of anti-seize onto the threads as this could contaminate the sensing area. Check if this part fits your vehicle. Four-cylinder engines have two sensors, while V6 and V8 engines have four sensors. The downstream oxygen sensor detects the change and informs the vehicles computer. 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. It is what tells your cars ECU when the AFR goes rich, stoic, or lean. . The tools used in this guided test may have been superseded and the products above are our latest versions used to diagnose the fault documented in this case study. The 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. 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. 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. Correct, yes that's the one. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. Could I buy universal one, if not why? Check engine light: whilst the check engine light can come on for many reasons, it is normally down to an emission related issue.
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