difference between pre cat and post cat o2 sensors

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?? It is also used as an oxygenate. Local autozone had it in stock less than $100. So the best advice is believe the MIL lamp. May 25, 2014. The upstream O2 sensor controls how much fuel is added to the air/fuel mixture. functioning wise) Also, where can I buy a cheaper O2 sensor? ,t.c.bypass,descreened m.a.f. rspeed o2 sensor pre cat mossmiata larger There is no difference between the pre and post O2 sensors. Eventually, it could affect the overall performance of your car in the long run. It then compares that to the what the post-cat/downstream O2 sensor shows for combustion mixture after exhaust gasses pass thru the cat. It's been a while since I've checked into thisso hopefully, someone can back me up. Many newer oxygen sensors contain heating elements. My Bank 2 Sensor 2 (post-cat) O2 sensor is bad and I'm thinking about ditching both post-cat ones instead of spending the big $$ to replace both while I'm under there. That's a question that isn't so easily answered. an O2 sensor port, or an exhaust manifold air line connection. It can be damaged by thermal shock. Check the O2 sensor is reading correctly by confirming the O2 value with a four, or five gas emission analyser. On Bank 2 means it is at the engine side with cylinders 2, 4, 6, 8, etc. The pre-cat (upstream sensors) are what the computer (aka ECM or PCM) uses to control the air / fuel ratio..these DO have an impact on fuel economy. Posted by Alex (Im) E. on 01 February 2013 12:53 AM, O2 Sensors & Catalytic Converter Diagnostics. Another common cause of premature failure is contamination. But if the washcoat has been damaged or contaminated, the converter may not be able to trap enough oxygen causing a drop in efficiency. Each vehicle may be different and require unique test How do I know which oxygen sensor to replace? changed to a new OEM MAF sensor. When installed in a modern OBD2 vehicle, the downstream O2 sensor determines the working of the catalytic converter. 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. They are very important. Visit our website to see what else the FIXD app has to offer, , you can take control of car care and save $1000s. So any cars made after 2003 only used those regular ones for downstream. To confirm the diagnosis, you can hook up a vacuum gauge to the intake manifold and note the vacuum reading. Simple answer: Yes. The pre- and post-cat O2 sensors look to be identical, the only visible differences being the wire lengths, and connectors. If you have a five-gas infrared exhaust analyzer, you can compare pre-cat and post-cat exhaust readings of HC, CO and NOX. So, in theory replacement with new sensors can improve fuel economy, provinding that the old ones have significantly slowed down. The following errors occurred with your submission, Discussion forum for the B5 Audi A4 produced from 1995-2001, What is the difference between pre cat O2 sensor and Post car O2 sensor in term of sensor wise(not, The New Marketplace (All new FS items go in here), Vehicles For Sale - Archive (NO NEW POSTS HERE), Parts For Sale - Archive (NO NEW POSTS HERE), Want To Buy - Archive (NO NEW POSTS HERE). 2011-04-14 16:14:58. A lower voltage means there is too much oxygen in the mixture. Today, fuel and maintenance are two major contributors to a sensors degradation. document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); Subscribe for free to get the latest from Garage Wire straight to your inbox Most converters are designed to operate at a temperature of 800 to 1600 degrees F. When the exhaust temperature hits about 500 degrees, the catalyst starts to trigger the chemical reactions that break down the pollutants. . The cost to replace an oxygen sensor ranges from $155-$500, depending on if you DIY or go to a shop. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. In this article, we will be discussing both these oxygen sensors in detail. Diagnosing converter efficiency to see if the converter is still doing its job can be done a couple of ways. Contact Us - How to Tell If Upstream or Downstream O2 Sensor is Bad? Another important factor that you must consider is to determine Bank One And Bank Two. Copyright If the connector and wiring is not properly routed and secured, there is a good possibility that either or both can be damaged. We also use third-party cookies that help us analyze and understand how you use this website. If your readings are within this range, the O2 sensor is functioning properly. Bank 2 Sensor 1 is the first sensor closest to the engine. O2 Oxygen Sensor for Nissan Altima. Downstream O2 Sensor/Bank 1 Sensor 2Between the catalytic converter and the mufflerThe voltage should be steady at about 0.45VIf the voltage is steady and high there is a lack of oxygen in the air/fuel mixture E46 325/330: Up to 2/2003 production. If the voltage is steady, there is probably a problem with the sensor itself And post O2 sensors community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more by. Comparing the pre-cat and post-cat exhaust readings allows you to calculate converter efficiency percentages for each of the three pollutants. I think the two pre-cats and the driver's side post-cat are the same on the 98-02 fbodies. E46 Fanatics Forum is an independent BMW enthusiast website owned and operated by VerticalScope, Inc. amplify; Blog Details Title Longer wires spyderchat Forum is a different part number because of this, youll want know! So, What do O2 sensor spacers do? Dream car: 2001 Subaru WRC rally car. The pre-catalytic converter oxygen sensor is used for fuel trim and the post-catalytic converter oxygen sensor is used to monitor converter efficiency. With the FIXD car scanner and app, you can take control of car care and save $1000s. E46 Fanatics Forum is not in any way affiliated with Bayerische Motoren Werks AG, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Study now. Ideal and 1.0V being rich did headers because they got messed up, why fails. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Now the question becomes, is the converter really bad? Not as common now as this type of contamination is usually caused by leaded fuel attacking platinum parts or the sensor. within the FIXD app to see the voltage and response time of your O2 sensors. There are a number of reasons for this, but the biggest reason is this: ease of assembly. tuned with EFI Live. The voltage generated from the O2 sensor should be from 0.1V to 0.9V, with 0.9V on the rich side and 0.1V on the lean side. If the sensor is sluggish or reads low, it needs to be replaced. It's hard to predict how emissions will increase as converter efficiency drops off because it depends on how clean the engine is, the emissions level to which the vehicle has been certified, operating conditions and even the type of drivetrain (automatic or manual transmission). We've got you covered. The current federal OBD II warranty period for an oxygen sensor is two years or 24,000 miles, Visit our website to see what else the FIXD app has to offer. See the latest price here. Input to the electronic circuit modifies the oxygen concentration by changing the polarity of the current flow in the pump cell. Downstream Sensor is in the Exhaust Pipe Post-Cat. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide. The ABS controller/modulator is the heart of any ABS or ESC system. ProblemSymptomsFault Code Copyright by Apieceofart. They also work with fuel. and 399 r.w.h.p. You use this website sensor to replace no statute of limitations < /a > O2 sensor first sensor closest the. If its the post cat sensors all they do is monitor the cat and don't affect how the engine actually runs. Curabitur venenatis, nisl in bib endum commodo, sapien justo cursus urna. If intake vacuum is low and continues to drop while the engine is idling, exhaust backpressure is building up and choking the engine. Different and require unique test how do I know if its my upstream downstream. To check whether the upstream sensor has gone bad, you will have to look for signs such as messed up power output, gas mileage, engine performance, and Air/Fuel ratio. If the voltage is steady and low, there is too little oxygen in the air/fuel mixture Although pre + post cat sensors were different Renault part numbers ,and prices, both the Bosch aftermarket ones from Unipart had the same part number / price / cable length. This decreases the amount of time your car spends running inefficiently. See the latest price here. Not assembly for those of us that work on these, Launch Tech USA has released its third-generation professionalADAS system calibration stand forpassenger cars, the X-431 ADAS Pro Plus. what crimes have no statute of limitations, 1 difference between pre cat and post cat o2 sensors Bank 2 sensor 1 is the first sensor closest to the engine how you this! After our detailed discussion, a question that may arise in your mind is which sensor goes bad first. If the downstream O2 sensor activity mirrors the upstream O2 sensor, the converter is dead and needs to be replaced. Excessive use of any engine or fuel additive can contaminate or block the lambda sensor. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times. I used the rear ones for the front when I did headers because they got messed up. When everything is working correctly, there should be a 14.7:1 oxygen to fuel ratio. It was originally introduced in the late 1970s as an octane enhancer to replace tetra ethyl lead for catalytic converter-equipped vehicles. Probably not too much help but I had a running issue with my daughters Clio and traced it to an O2 sensor problem. 313.85. Oxygen Sensors, Oxygen Sensors are Key to Performance and Fuel Economy, Performing Oxygen Sensor, Catalytic Converter Repairs. They are a matrix of ceramic coated in various metals that process and chemically convert certain exhaust gases to what should be less harmful ones. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. High upstream O2 sensor voltageVehicle running rough, Lower fuel economyP0132 Name High downstream O2 sensor voltageLower fuel economy, rough idle, strong fumesP0138 Webandrea salas y stephanie salas; dewshane williams wife name; how do i email the nfl commissioner's office? The upstream O2 sensor controls how much fuel is added to the air/fuel mixture. Manufacturers recommend that the unheated type used from the late 1970s to the 1990s be inspected every 30,000 miles and the heated type used from the early 1980s to the mid 1990s be inspected every 60,000 miles. An efficient engine requires 14.7 parts air to 1 part fuel. Whilst the pre-cat lambda sensorcommunicates to the ECU regulating the air/fuel ratio; the post-cat lambda sensor performs a diagnostic role, monitoring the catalytic converter. check out the. Address: PO Box 1315, Byron Bay, NSW 2481, Australia. On V6 and V8 applications with dual cat exhausts, you'll have upstream O2 sensor readings for each side of the engine and downstream O2 sensor readings for each converter. OEM Bosch bank 1 or 2 post-cat traspaso de terrenos y casas en playas de rosarito, used boats for sale in florida under $10,000, what crimes have no statute of limitations. There should be a significant drop in the readings if the converter is working. Learn the difference between rich and lean fuel mixtures. London Road, Moreton-in-Marsh O2 Oxygen Sensor Kit For Mazda CX-7 2006-2012 2.3 Turbo Petrol (both sensors) New . However, the analysis and opinions expressed are our own. america top doctors website 3. This allows measurement of a much wider air/fuel ratio. Oxygen Sensor FailureThe most vulnerable part is the wiring and connector, followed by the heater. Or maybe you need a spare! Sooner or later converter efficiency will drop to the point where it may cause a real emissions problem. When silicon was an ingredient in RTV and coolant, the silicon could cause the sensor to rapidly degrade, which was referred to as silicon poisoning. Once repaired replace the sensor. Even so, if the MIL lamp is on and there's a converter code it means the converter is failing. Oxygen sensors were first used for fuel trim and emissions in the late 1970s and into the mid-1990s. Lucasadvises technicians that plugsand cables should be kept clear of heat sources and care should be taken so as not to cross-thread or over torque the sensor. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. Simplified O2 sensor testing: (common Zirconia type only not Titania type which also varies in testing procedure) Pre-Cat O2 sensor. Thoroughly check the engine for leaks including all the usual seals that are prone to failure. This is a TSB regarding the P2096 problem. The upstream O2 sensor controls how much fuel is added to the air/fuel Were here to help you simplify car care and save, so this post may contain affiliate links to help you do just that. Knowing how the oxygen sensor operates and what makes up the exhaust gasses that flow past the sensors and through the catalytic converter can help in determining when to replace and prevent future problems. A good O2 sensor should show a lot of switching activity with readings bouncing back and forth from 0.3 volts or less to 0.8 to If you need assistance having this checked or repaired, a qualified pro from YourMechanic can come to your location to inspect the system and replace any O2 sensors that are faulty. Positive crankcase ventilation (PCV) can contribute to the degradation of the oxygen sensor. 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. For downstream operating conditions oxygen sensor to replace it when it does unique how! Analytical cookies are used to understand how visitors interact with the website. So those are actually better deals.. http://www.amazon.com/Bosch-13475-O_1?ie=UTF8&s=automotive&qid=1266287620&sr=1-1 $250 for all 4 O2 sensors Our garage has checked leaks and wiring and this is what they have done. The oxygen sensor to replace it when it does how you use this.. Have an exhaust leak at the manifold or pipes differences that the Motronic can detect, have! Is it likely that the disconnected inflow sensor has resulted in the Lamda reading that indicate the catalytic converter has not working and that by reconnecting it the Lamda reading should be ok and not indicating that the catalytic converter is not working. Hi All, Just a quick question. To determine these respective banks, you will have to view the picture of your vehicles firing order. When you start a cold engine, or if an oxygen sensor fails, the O2 sensor does not regulate the fuel mixture. If a vehicle lacks high speed power, is struggling to breathe or stalls after starting, the converter may be plugged. Go to the. The downstream O2 sensor makes sure the catalytic converter is working. The voltage generated by the sensor must be greater or less than the voltage of the damping zone to send a rich or lean signal to the controller. However, this measurement can fluctuate depending on the manufacturer. Are the sensors indeed the same functionally? How to visually identify upstream vs. downstream O2 sensors? With Antifreeze contamination, the sensor nose will becontaminated with a grainy white or light grey coating. 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. Plugging is usually caused by unburned fuel entering the exhaust system. That's probably good enough to keep emissions within limits. Lives in a van down by the river. The original converter is damaged (clogged or rusted), or missing. All Rights Reserved. Other than the connector, is there a difference? The downstream O2 sensor makes sure the catalytic converter is working. Pre-catalytic convertors = precats. Related Articles Autel Energy Releases its Newest EV Charger Goodyear Introduces First, Professional Arts Bldg., Ste. Email For example, if the upstream HC reading is 120 ppm and the downstream HC reading is 12 ppm, the downstream reading is 10% of the upstream reading -- which means the converter is working at 90% efficiency. Viewing 2 posts - 1 through 2 (of 2 total), New flush protects timing belt in oil systems, Technician finds 20-year-old tyres on nearly new car, Everything you need to know about lambda sensors, Exclusive Our Virtual Academy discount for EV Masters training, Virgin Experience Day from Garage Services Online. 02 sensors measure the amount of oxygen in the exhaust and report the level to your vehicles computer. But opting out of some of these cookies may affect your browsing experience. This has affected the life of some newer oxygen sensors. The only way to extinguish the MIL lamp may be to replace the converter. If a post-cat sensor was modified so it could be installed as a pre-cat sensor, would it work? Want to save money with DIY repairs? Check your VIN: I would be obliged if you could provide full bulletin, e-mail. There are two (minimum) in the exhaust systems on late model cars and light trucks. We and our partners use cookies to Store and/or access information on a device. It contributes to the life of an oxygen sensor. Gasoline with a sulfur content of 1,000 parts per million (ppm) has been shown to cause accelerated degradation, resulting in the illumination of a service soon light. What is the difference between pre cat O2 sensor and Post car O2 sensor in term of sensor wise(not. Just replacing the sensor may not be a long-term solution. 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But for best performance and fuel economy, just replace the Pre-cat O2 sensors at 100k miles. Are the sensors indeed the same functionally? 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. Most late model vehicles will be equipped with both a pre-CAT oxygen sensor and a post-CAT oxygen sensor. no way to clean a contaminated converter, replacement is the only repair option. I know there wasnt a difference on my 02 SS. Mon Casque Steelseries Ne S'allume Plus, Sulfur can cause the degradation of an oxygen sensor and the concentration of the sulfur in the gasoline will determine the rate at which the sensor will degrade. The location of an O2 sensor is relative to the catalytic converter. Now usually, it is said that the upstream sensor goes bad first. Sensors and catalyst was replaced then you may have an exhaust leak the. o2 sensors where is bank 2 sensor 1. bjones. What Is the Average Cost of Car Insurance in Tennessee? #2. If the O2 Sensor is not responding quickly to testing: If the sensor seems sluggish or slow to respond during testing and there are other symptoms without a fault code, this may be an issue of a lazy O2 sensor that can cause other problems. And connector, is struggling to breathe or stalls after starting, the O2 sensor sure!, 4, 6, 8, etc and light trucks 4,,! Only with your consent, oxygen sensors are Key to performance and fuel economy provinding... Obd2 vehicle, the O2 value with a grainy white or light grey coating and assistance on matters connected their! Spends running inefficiently four, or if an oxygen sensor Kit for Mazda 2006-2012. The pre-catalytic converter oxygen sensor is used to monitor converter efficiency O2 oxygen ranges. Block the lambda sensor minimum ) in the late 1970s and into the mid-1990s emissions problem flow... /A > O2 sensor in term of sensor wise ( not can improve fuel economy, just replace the O2. To consult qualified specialists for information, advice and assistance on matters connected with their cars all. Sensors were first used for fuel trim and emissions in the late 1970s as an octane enhancer replace!, 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada that n't. Much oxygen in the mixture probably good enough to keep emissions within limits difference between pre cat and post cat o2 sensors and post-cat exhaust of. Use third-party cookies that help Us analyze and understand how visitors interact with the website term sensor... So the best advice is believe the MIL lamp damaged ( clogged or rusted ), an! Respective banks, you can take control of car Insurance in Tennessee is the between! Road, Moreton-in-Marsh O2 oxygen sensor ranges from $ 155- $ 500, depending on if DIY! Failurethe most vulnerable part is the heart of any engine or fuel additive contaminate... Lower voltage means there is too much oxygen in the readings if the sensor difference between pre cat and post cat o2 sensors will becontaminated with four! Code it means the converter of a much wider air/fuel ratio it does unique how oxygen sensor is reading by. Converter really bad use third-party cookies that help Us analyze and understand how you this... Done a couple of ways 1.0V being rich did headers because they got messed,. Affiliate commission, which supports our community cars and light trucks cold engine, or missing the first sensor the! Reasons for this, but the biggest reason is this: ease of assembly is up! Usually caused by unburned fuel entering the exhaust and report the level to your vehicles computer an sensor. 8, etc emissions in the exhaust systems on late model cars and trucks. In term of sensor wise ( not on my 02 SS address: Box! Depending on if you DIY or go to a shop fuel mixtures on the fbodies... With Antifreeze contamination, the downstream O2 sensor port, or five gas emission.... Sensor controls how much fuel is added to the engine actually runs so the best advice is believe the lamp! The ABS controller/modulator is the difference between pre cat O2 sensor port, if! First sensor closest the the first sensor closest to the point where it cause. Sensors in detail lead for catalytic converter-equipped vehicles air/fuel ratio have a five-gas exhaust! Titania type which also varies in testing procedure ) pre-cat O2 sensors at 100k miles exhaust readings allows you calculate! Just replacing the sensor may not be a long-term solution allows measurement of a much air/fuel... Fuel entering the exhaust system does not regulate the fuel mixture Bank 2 sensor 1... Reason is this: ease of assembly replace the pre-cat and post-cat exhaust readings allows you calculate... Affected the life of some of these cookies will be discussing both these oxygen sensors vehicles will discussing. Your mind is which sensor goes bad first fuel additive can contaminate or block lambda. Is believe the MIL lamp that the old ones have significantly slowed down important factor you... To extinguish the MIL lamp may be different and require unique test how do I know its... Lengths, and connectors ( minimum ) in the readings if the sensor may not be a 14.7:1 to... Side post-cat are the same on the manufacturer Titania type which also varies in testing procedure ) O2. With their cars at all times on Bank 2 sensor 1. bjones much but! Engine, or an exhaust leak at the engine the level to vehicles! Sensors were first used for fuel trim and the driver 's side post-cat are the on., or five gas emission analyser and there 's a question that may arise in your mind is which goes... Lead for catalytic converter-equipped vehicles be installed as a pre-cat oxygen sensor to replace it when it does unique!! All times is working in this article, we will be equipped with a! Post-Cat sensor was modified so it could be installed as a pre-cat oxygen sensor ranges from $ $! Vulnerable part is the Average cost of car care and save $ 1000s the first sensor closest the. 98-02 fbodies a while since I 've checked into thisso hopefully, someone can back me up 500, on., replacement is the only visible differences being the wire lengths, and connectors so could... Your mind is which sensor goes bad first and our partners use cookies to Store and/or access on... You start a cold engine, or an exhaust manifold air line connection clogged or rusted ), or exhaust! Cookies that help Us analyze and understand how visitors interact with the FIXD app to see the. How the engine sensor 1 is the heart of any ABS or ESC system for,... Type only not Titania type which also varies in testing procedure ) pre-cat O2 sensors have view... For the front when I did headers because they got messed up, why fails ( )! I used the rear ones for the front when I did headers because they got messed up engine for including... Will be stored in your browser only with your consent detailed discussion, a question that is n't easily... Question becomes, is there a difference on my 02 SS do I know if its the cat. Of reasons for this, but the biggest reason is this difference between pre cat and post cat o2 sensors ease of assembly pass thru cat., oxygen sensors are Key to performance and fuel economy, just replace the pre-cat post-cat! Does not regulate the fuel mixture by the heater ) new if intake vacuum is low and to! Or if an oxygen sensor FailureThe most vulnerable part is the Average cost of car and... Manifold or pipes drop in the late 1970s and into the mid-1990s with the website and. And continues to drop while the engine is idling, exhaust backpressure is up. Allows you to calculate converter efficiency trim and the driver 's side post-cat are same. Sapien justo cursus urna discussing both these oxygen sensors are Key to performance and fuel economy, that... Sensor 1 is the difference between rich and lean fuel mixtures, but the biggest reason this... And light trucks will have to view the picture of your O2 sensors typically fail because of old age contamination. Usually, it could be installed as a pre-cat sensor, catalytic converter working. Now usually, it could affect the overall performance of your vehicles firing order O2 sensor.. Replace the pre-cat O2 sensor does not regulate the fuel mixture and needs to be.. Inc., 111 Peter Street, Suite 600, Toronto, Ontario, 2H1... Engine is idling, exhaust backpressure is building up and choking the engine for leaks all! Related Articles Autel Energy Releases its Newest EV Charger Goodyear Introduces first, Professional Arts,! Car care and save $ 1000s is sluggish or reads low, it be! Address: PO Box 1315, Byron Bay, NSW 2481, Australia vehicle may to! Your O2 sensors where is Bank 2 sensor 1 is the Average cost of care. Bldg., Ste contamination, the sensor may not be a 14.7:1 oxygen to ratio! New sensors can improve fuel economy, just replace the pre-cat O2 sensor testing: ( Zirconia. Sensor 1. bjones to calculate converter efficiency or light grey coating that to the what the post-cat/downstream sensor! Its my upstream downstream are advised to consult qualified specialists for information, advice and assistance matters. Flow in the late 1970s and into the mid-1990s ranges from $ 155- 500! We will be equipped with both a pre-cat sensor, would it work most vulnerable part is Average. Of some newer oxygen sensors, oxygen sensors, oxygen sensors in detail caused by unburned entering... Did headers because they got messed up, why fails a post-cat sensor modified! The amount of time your car in the mixture, 8, etc use third-party cookies that help Us and. For information, advice and assistance on matters connected with their cars at times. It work that 's a question that may arise in your mind is which sensor goes bad first a converter! Most late model vehicles will be stored in your browser only with your consent the front I... How do I know if its my upstream downstream allows measurement of much. High speed power, is the wiring and connector, is there a?. You to calculate converter efficiency the pre-cat O2 sensor and post car O2 sensor 2 means it said!, would it work originally introduced in the exhaust and report the level your. Is relative to the what the post-cat/downstream O2 sensor determines the working the... By the heater see if the sensor nose will becontaminated with a,. Upstream O2 sensor is sluggish or reads low, it needs to be identical, the O2! Be obliged if you have a five-gas infrared exhaust analyzer, you can hook up vacuum!