OBD diagnostic scanner that I bought on Amazon. Don't let trouble code P0171 or P0174 leave you without your ride and, worst of all, with an expensive repair bill later on. If you do end up getting a new catalytic converter, make sure you get one that meets your state's requirements, or else you may find the check engine light coming on again. I have a 2004 Infiniti G35 and the bank 2 catalytic converter has triggered the check engine light. Or worse, it actually could be that the catalytic converter needs to be replaced. Get in the Zone. I'm going to try your method with the higher octane gas later once my tank is low on fuel to properly test this method. You need to have your mechanic perform a through test to locate the true problem. My car is Honda Accord 2006. Is it likely that if the cleaning didn't work, that it is faulty? Once you rule out the catalytic converter with your own scanner, go find an honest repair shop to figure out why you can’t go over 10 mph. Use just all 91. This is an old trick on the MKIII engine but has not been tried on the MKIV. I am going to try running a tank of high octane gas through my car next week on my drive from VA to GA. For example, if the cause of your check engine light coming on was a loose gas cap, if it's tightened, the light will turn itself off. Here is a huge secret that has not made it into the public domain yet: If you remove a rear oxygen sensor and pack it with red RTV silicone, that will destroy the oxygen sensor in a way that will trick your car's computer into thinking the catalyst is okay. There is no way to do that remotely, which would only be guess work. Mechanic reset me after last viist with no findings of any problems... but if course a few days later, light is back on, same code. I have already replaced the spark plugs, # 3 and #4 fuel injectors, and the O2 sensor-upstream. However, a catalytic converter does not normally wear out. Question: How does the P0420 OBD code affect the performance of the car? I have had several CCs changed over the years in various vehicles. $111 for a diagnostic and they told me it was the code for the oxygen sensor/catalytic converter. Likewise, if your catalytic converter is going functional, and you did a lot of stop-and-go driving, that may have turned on the check engine light due to the high usage of the converter. If the light goes off, we assume things are okay. I would not trust those words. He just doesn’t know how long I have. The code will happen if the upstream and downstream oxygen sensors indicate similar readings. There’s no rush, no need to drive endlessly in one session. Do you order numerous tests? I found that there is an easy method to clean it out, after which it registers good catalyst system efficiency again. Answer: You should never have removed the Catalytic Converter. Below we have highlighted the most common causes of a check engine light. I might try the engine cleaner since it costs less than a tank of high octane gas. I used an OBD diagnostic scanner that I bought on Amazon. After you reset the check engine light with the diagnostic scanner, the car’s computer will indicate a “Not ready” status until you’ve driven a while. That saves costly car repairs. I hope nothing major comes out of it. Hey Glenn, I have a 2007 Suzuki Grand Vitara and i'm of course getting the imfamous P0420 code. The light has not come on again. The problem most likely is a bad oxygen sensor. Glenn Stok (author) from Long Island, NY on September 17, 2019: Amanda M - It’s definitely worth a try before you spend more money. Then I got one O2 sensor replaced. I feel that he hasn’t run enough tests to know this is what it needs for sure. Question: I have a 2006 Subaru Outback. What do you recommend in this case? Never do this to a front oxygen sensor because it will mess up the fuel system. It doesn't happen in 1st gear at all, only 2-6. Is my car's new catalytic converter bad or could it be that the o2 sensors need to be changed? We’re in GA. Glenn Stok (author) from Long Island, NY on December 30, 2019: Michele Solomon - Since you got gas from a different station, it's possible that it had water in the gas. I have a 2005 Nissan Altima. My car started making a loud noise and I couldn't go over 10 miles. OBD Code P0420 means the catalyst system efficiency is below the threshold. Hey Glenn, I have a 2006 Cryssler Pasifica and i'm getting the P0420 code. Is it too late to try the high octane gas method mentioned in this article to fix my catalytic converter? The functionality is different (flammable vs. combustible). It's helpful to know that there can be other solutions. This actually works about half the time. Regular automotive preventative maintenance is conducted at intervals that, allow you to discover potential issues before they become serious problems down the road. The sensors will trigger an Onboard Diagnostics (OBD) trouble code that’s stored in your car’s computer. Question: I have a 2011 Chevy Cruze. In addition, a reputable mechanic would know if the new sensors they installed were compatible. It worked for me. This simple, no-cost home remedy will surely make you pass the emissions test even if you have already failed the test once. Drive until you’ve used up half the tank. If you go for the inspection before the system indicates “Ready” you will fail the inspection. For example, if the cause of your check engine light coming on was a loose gas cap, if it's tightened, the light will turn itself off. Now he is telling me i need to change the converter. That can reduce the efficiency of the catalyst too. I had an O2 sensor reading and my mechanic changed the sensor 2x but it keeps getting the check engine light come back. The mode6 data could be because that monitor has not run yet in that drive cycle. So, they did the repairs but I'm still having a slight jerk in 1st gear. Even worse, you need to have an annual inspection soon, and your vehicle won’t pass unless you get your catalytic converter repaired. Besides, some contain lead and are highly oxygenated. Having a good mechanic you trust is still crucial, but it's nice to have the ability to know what's happening and to do something about it before spending a lot of money. My mechanic told me I needed to change the cat converter (bank 1). You can find that information on the sticker under the hood. So you should have your mechanic put your car on the lift and eyeball the situation. Here's why your Camry's "Check Engine" light comes on and what the codes mean that it generates. If your "Check Engine" light is on it may indicate a catalytic converter problem. The initial code I got was P0420 which led me to replace both the catalytic converter and the oxygen sensors. Presently I can't afford to have it replaced since I have just paid out a lot of money. Answer: The higher the octane, the higher the temperature required to ignite. I just had my catalytic converter put on my 2013 Ford Focus SE and the check engine light is on. Advice from an experienced RV owner that will help you to save a small fortune when you need to repair your camper, travel trailer or motorhome. Thank you. According to the mechanic who diagnosed it, the existing cat is CA compliant. Now today driving into work, it sounds like my muffler is bad. Higher octane usually has more additives and especially better detergents that help clean out buildup of contaminants in the catalytic converter. Fill on a close-to-empty tank. Thanks again. The Catalytic Converter is in the line of the exhaust between the engine and the muffler. Knowing if we should continue driving or stop right now is difficult. All I did was buy myself a universal 3 way converter for under $100, cut out the old converter leaving enough pipe to fit inside the new converter then weld in place. Later the light went off. Thank you for offering this helpful information. The engine light of the car pops up intermittently and looses power (AWD). You are absolutely correct. Some mechanics charge you just to do the same thing, and you’re still no better off. Mechanic #1 said it was the cat and gave me a quote for an OEM part: $2500 because my car has CA emissions standards. Answer: If it’s running below the required threshold with OBD code P0420, it means it’s putting out more pollution than desired. I only replaced one so far. Since the light came back on with the same code, that means you probably never needed to replace the catalytic converter. However, the engine light came off this morning, should I go to replace it because I have make an appointment to replace it next week. I followed your suggestion and ran a full tank of high octane gas in my car. Catalyst System Efficiency Below Threshold. I am going to be trying your method. Answer: Racing fuel is high octane. I just had a magnaflow direct fit, catalytic converter installed and the problem was fixed. It saved me the cost of having any work done and it worked for several of my friends already too. Failing oxygen sensor (remember that’s always a possibility). Answer: That P2099 trouble code indicates that the powertrain control module (PCM) is malfunctioning. That does not affect performance, nor will it cause damage to the car. Question: My county in Texas does not require an emissions test, is it bad for the car to run with the catalytic converter running below threshold? You need to have a new Catalytic Converter installed. My engine light came on, autoshop said it would cost 3k to replace the “cats”. P0341. Replacing a catalytic converter or "cat" has become a big, expensive drain on a lot of people's budgets these days. I am not responsible for anything you do to your car. I would have 2 push in the clutch and keep revving it up. If the O2 sensor fails, will the OBD scanner indicates it is the converter problem still ? Your mechanic told you that you need a new catalytic converter, and it will cost you $900. If these inputs aren't in balance, the cat doesn't work well. Regular gas ignites with a spark because it’s flammable. So my 2006 Nissan Altima is having issues accelerating. Took it 2 a different auto car place they read me off the code. The light stayed off until I filled up with gas again, and then the PO420 error message came up. Catalytic converters should be diagnosed using proper methods involving more than a code reader. If you spend $900 or more to replace the catalytic converter, you may discover the check engine light coming on again later. Glenn Stok (author) from Long Island, NY on August 04, 2019: tcysimon10 - Since your light went off by itself, you might just have an intermittent problem. Solution: Replace the entire down pipe with all new components. The scanner has an LCD display that clearly shows the trouble code and indicates which device is malfunctioning in your car. I have 02 RAV4 with 239K and already went through 4 CATs since new. The check engine light, one of the most obvious indicators of a malfunction in your car, is also one of the indications of a bad catalytic converter.When checked by a compatible device, it gives a catalyst fault code which must be decoded with the help of the operating manual. Ford recalls on transmission and engine oil leaks. https://photos.app.goo.gl/NSvrDlPW35cbRUMA3. The AutoZone Fix Finder. My van has 190,000 miles on it, and it runs rough sometimes when first started, but it usually smooths out later. Knowing how to retrieve OBD trouble codes when the Check Engine light comes on will help you save time and money. Further suggestions will be appreciated very much. The powertrain control module (PCM) will continue to run tests even after a failure has been detected. I'm going to try your method and see what happens. Sometimes the CEL will simply go off by itself. When I did it, I just did my usual driving. Question: Will the check engine light (service engine soon) go off after the high octane remedy without the diagnostic tool? Could this just be because o2s weren't talking to each other. Glenn Stok (author) from Long Island, NY on December 02, 2019: Egbert Mntungwa - If you are asking about using standard gasoline—NO! There is usually some other reason for their failure. Why would 3 OBD readers say the same thing and replacing the part make it worse and die? We were told by a garage that our cat converter needed replacing, but something told me there was something else to try. Likewise, if your catalytic converter is going compelling, and you did a lot of stop-and-go driving, that may have turned on the check engine light due to the high usage of the converter. The high-octane gas actually cleaned it out. It could be that merely using a different gas avoids any issues with bad gas, such as water in the fuel. I have recently gotten a P0420 error message. When a converter is bad or failing, the rear oxygen sensor shows a lot of oxygen coming out of the converter, and therefore the light comes on to show that the converter is not healthy. Ive been driving it for about 2 years with the check engine light on. Glenn Stok (author) from Long Island, NY on August 31, 2019: Maria - Same answer I just gave to Aimee Guidry below. How high is high octane? That will dilute the gas, and my method won’t work. When it happened again, I filled up with high-octane and the problem was once again resolved. Now I hear the rattle indicative of catalytic converter issue. I drive a 2002 Chevy Impala and the check engine light has been coming on for about 4 years. You can’t. So why would this be illegal? Now at about 100,000 miles the check engine light started coming on, and we needed to replace the oxygen sensor at a cost of about $450. It doesn't return until roughly 3-4 days after it turned off. Using a scan tool is the easiest way for check engine light reset. A few months back it started dying when it got warmed up at stop lights or anytime i would slow down or turn corners. Thank you. That is because the engine modifies the air/fuel mixture based on data received from the oxygen sensors that are before and after the Catalytic Converter. Exhaust leaks and bad cats. You need to go to a reputable mechanic to have it checked out. Can't express how grateful we are to you, thanks again! Max (author) from USA on October 19, 2018: @dpfast Sensors never cause a P0420. That would indicate that the unit just needs a good cleaning that a tank full of high octane would do. A check engine light going on and off intermittently signals an engine misfire, causing damage to the catalytic converter and other engine components. This article is accurate and true to the best of the author’s knowledge. I haven't gotten an error message for the downstream one yet. Glenn Stok (author) from Long Island, NY on December 04, 2018: Mozee - You should report that machanic for fooling you. If a light is on, you either need to take your car to a professional or use your own OBD-II tool to diagnose the code to see if it is a catalytic converter problem. It’s too late to try my method. If the light continues to come back on with the error code, then you might have faulty sensors. This trouble code appears when the unit can’t sufficiently reduce the carbon emissions from the exhaust. That's why car manufacturers integrate them into the exhaust manifolds. I have no idea what more it could mean and I spending way too much for the check engine light to keep coming on. Instead I went with mechanic #2 that put on an aftermarket cat for $500. When a car is running too cold from a long warm-up time, for example, let's say if the thermostat is bad, the same thing can happen: good-bye converter. My mechanic said not to worry. The issue could simply be that the sensors are faulty, and that will give the same code as if the catalytic converter was bad. You could have an exhaust leak. Martin Olsson via Wikimedia Commons CC BY-SA 3.0. Likewise, if your catalytic converter is going functional, and you did a lot of stop-and-go driving, that may have turned on the check engine light due to the high usage of the converter. Are you sick and tired of the guesswork? Gas cap issues can reduce fuel pressure and allow fuel vapors to escape, reducing fuel economy and increasing harmful emissions. Converters that have failed in these ways can often be brought back to life using a cleaning product called "cataclean." Other Ways of Diagnosing Catalytic Converter Failure One of the first things an experienced mechanic will do to trace a clogged converter is they will temporarily remove the oxygen sensor or unbolt the exhaust downpipe. You only need to do this once. When scanning the onboard modules, the $01 module is faulty but no codes. Emissionguy is a professsional car mechanic who enjoys the outdoors, dogs, guns, riding, relaxing in the sun, and pool. Hello! hardlymoving from Memphis, TN on August 16, 2011: I had a converter go bad on my 94 Ford Explorer. Glenn Stok (author) from Long Island, NY on January 16, 2019: Natalie RG - The dealer who sold you that car lied to you. I have a 2001 grand prix GT that was having acceleration issue and I determined that it was a catalytic converter issue. I got both the oxygen sensors as well as the catalytic converter replaced but the check engine light came back on after 4 days of driving. That does not provide a guarantee that it won't turn on again, especially if the situation is erratic. I think my mechanic mentioned we're only replcing 1 to start?) Mechanic said that since my car was made in CA, I would have to get a CA catalytic converter. You run the fuel tank low, dump one can of this liquid into your tank, drive for twenty minutes, and then fill up the tank. We tested it with a scanner. That caused the engine to shut down. Or, could it still be something rather simple? I discovered this trick you can try first. What would cause my CAT reading to register as unready? See the section "What Next, If You’re Going for a State Inspection?" That means the catalytic converter is functioning below the normal efficiency levels. Thanks! I use a low-cost diagnostic tool to see the vehicle’s check engine light OBD error codes. Past codes came up as the catalytic converter and gas cap. Question: I just had my catalytic converter changed as it was bad as it had all the symptoms (bad fuel consumption, loss of power, problem shifting gears, etc) since I got it replaced the car runs perfect like it did when I first got it. You’ll feel it because it will be as if you have a clogged fuel filter, and the engine will tend to stall out under heavy loads. This is the first I’ve heard of needing a specific state CC. There is a Union 76 near me that has 101 octane racing fuel. The they cleaned it and replaced the muffler. I read on another post to add two cans of Seafoam to the tank when it's half full. That is only necessary to get all the signals to reach “ready” state after the light has already been turned off, as I explained in this article. The car’s performance is only affected if the catalytic converter is extremely clogged, reducing fuel efficiency. Could you please clarify this for me? I think what's happening is that your oxygen sensor or the catalytic converter itself is on the verge of failing. One before and one after. My question is are there multiple catalytic converters on my van, and could the welding that was done cause the other to go bad? Of course i didn't buy it cause i know my car doesn't have a belt. Whatever you read that suggested that should not have taken seriously. Poor engine performance. If the high octane remedy that I discuss in the article works with clearing the catalytic converter, then the sensors will stop sending an error code to the computer. But, unfortunately The engine light comes on again. Was wondering if you believe that to be a catalytic converter that needs to be cleaned or replaced. Head to a service station to get it replaced if you do not want your car to fail the emission test. On their advise, I had the oxygen sensor replaced first. You sure kept excellent records as proof! But if that didn’t work, then the method I described is worth a try before spending money on a repair. I followed everything the article suggested after failing emissions with trouble codes P0420 & P0430 on 12/4/18 at 15:19:16 but 20 days later I went back for a retest on 12/24/18 at 14:29:26 and got the paper in my hand signed with the overall results: PASS. But I'm not here to hawk overpriced cleaning chemicals. The check engine light essentially means that your vehicle’s onboard computer system has self-diagnosed some kind of problem. However, there are still other less-costly causes for a trouble code P0420. Now i do a lot of highway driving, roughly 1500 miles a month unfortunately. Its dual view helps prove insurance claims. It's easy to do and here's how. I had an ignition coil and two spark plugs fail at the same time. This light does go off by itself, but only after a very long period when it detects no further errors from sensors. My car would not go over 50 mph on the highway. I first got a P0420 code two years ago after a cross-country roadtrip. I am not sure what can be done to fix this. Since then, all cars had to be OBD-II compliant. Would disconnecting the battery and reconnecting make the light go out? Paying under $40 for your own scanner is a lot cheaper than $1000 for a replacement you may not need. If you see the "Service Engine Soon" light come on, don't panic! Code is P0420.... has been the same code the last 3 or 4 times its come on. Do you know for a fact that they actually installed a new catalytic converter? You need to go back and get them to do the job right. We've stayed up on all of our maintenance, but the warranty won't cover it because they are saying it's our fault and we should have brought it in sooner. Glenn Stok (author) from Long Island, NY on March 23, 2019: Leroy polczynski - It looks like you were screwed. If your vehicle uses OBD-1, then you’ll have to purchase a diagnostic tool with a 12-Pin connector that is designed to read those older codes. They changed the catalytic converter and ordered me a new gas cap. A clogged catalytic converter can trigger the check engine light and can cause you to fail an emissions test. In particular, that code refers to the PCM’s failure to control fuel trims to keep the air/fuel ratio correct. He took pictures of my converter and it showed instead of replacing the converter, with a new one, they merely cleaned it and welded the pipes. Try my method first. The car runs fine and not any unusual smells noticeable. It’s not that they are lying to you. To answer your question, since those three things have been determined to be bad, they should be replaced even if no code is present. When i disconnecting the battery the engine light comes off. It will save you from making these mistakes. Then "drive it like I stole it" for a while. Some mechanics will tell you that a converter never goes bad on its own: there is always something else wrong with the car. Finding out why your Check Engine Light is on may help you save gas and avoid more problems down the road. I was thinking of getting about 9 gallons of 91 and then 1 gallon of the racing fuel. That might also be a result of a severely damaged catalytic converter that needs to be replaced. Kim2480 via Wikimedia Commons (CC BY-SA 3.0). Answer: You are correct that other things can cause the P0420 code to appear, such as the problems you mentioned. Can you please advise how can I ensure I get the right one and tell the exact specifications to get the spare part. How can I troubleshoot issues with my Catalytic Converter? Tampering in such a way as you did can cause the engine to malfunction and maybe even fail to start. I have this 2001 toyota camry with 2.2 le troubled code P0420.I installed 3 catalytic converters but P0420 will not disappear.All O2 sensors are new,new egr valve and new vacuum modulator.VSV valve is also new.Whats going on here,can somebody help,will appreciate. Let's talk about how your car knows the converter is bad in the first place. Ford has a few recalls that I was wondering if it could be the cause of the light coming on. I already used your method to fill the gas with high octane for 3 times. I have had to replace fuel pump.. O2 sensors and vapor canister. Another mechanic sent this other converter trick to me, and I tested it today and it did work. Answer: The rattle you mentioned indicates that something might be loose. Your old vehicle may fail to pass the required smog test. I’ve done this twice. I filled up with gas at the end of the trip and the check engine light came on. How to Reset/Turn Off the Check Engine Light. If I replace it with a universal Magnaflow catalytic converter (approximately $100) will the check engine light come back on? Dealer changed them out now have the infamous cat code,p0240! You’ll save yourself a trip. Proceed at your own risk because modifications to your car's emissions controls can cause permanent damage to your car. You'll be waiting for the light to go off, and this may take weeks or months. Or you might have damaged wiring or connectors to the O2 sensors. I have a 2002 4runner. You can also look for the 12-Pin OBD-1 port that was usually under the hood. Below we have highlighted the most common causes of a check engine light. This leads me to believe the rest of what you have written is BS, as well. Here is how you can find free air, and also how to set your tire pressure for the best performance of your tires and your car. Well, the check engine light has been on since I bought it and they explicitly told us that it was just an error with the o2 sensor and we shouldn't worry about it as everything was working fine. When a mechanic sees error code P0420, he or she will tell you that you need a new catalytic converter. Now, continue driving as usual for a week. I drive a 2006 pontiac grand prix which had 150K miles at the time. Just don't dilute it. My engine light was on and off for a couple weeks then stayed on long enough that I took the car in to get checked. But this will be really useful for someone who has that dreaded 'need a new one' syndrome. I'm still alive and my engine light is still on. OBD-2, which began in 1996, uses a 16-Pin port located under the dash. The car went faster than usual and sounded like if the car had farted. Finding the source of the problem yourself could save you hundreds of dollars. I received the code stating to change catalytic converter. If it doesn’t come back on that means I have a while. Glenn Stok (author) from Long Island, NY on August 07, 2019: Tyler Dunlap - The fact that your light keeps resetting and then coming back on indicates you have an intermittent problem. I'm also happy to have a diagnostic code reader now to do my own research when problems arise. My car no loss of power, no strange odors, or any rattle noises. There is a lot of truth to this. If it continues to stay off, you’ll know it was only a contaminated catalyst system. In addition, you will now be registering an error code that will prevent you from passing your State’s emissions test. Glenn Stok (author) from Long Island, NY on August 14, 2019: Dipen - It sounds like you never needed a new catalytic converter. What are your thoughts? I tested every feature for this review of the Z-Edge S3 Dash Cam. It’s the fact that high octane gasolines usually have more detergents and less chance of water vapor mixed in. Have a good and safe trip. The CEL came on the next day and the diagnostic code was P2099. Recently at 269,000 miles the P0420 code came on again. How to remove and install an oxygen sensor in 4-cylinder Volkswagen compacts produced from 1993-1996. Today we ended up passing our State Inspection with flying colors. If the light begins flashing, however, it indicates a more serious problem, such as a … I discovered how to avoid expensive car repairs when the check engine light is on. An illuminated check engine light or malfunction indicator lamp (CEL or MIL) with a catalytic converter diagnostic trouble code (DTC) is the most common catalytic converter … Ive also used a $30 recommended cat cleaner from the auto parts store. Is your DMV renewal date nearing? Day the service engine soon '' light come back on with code P0420 means the catalyst too up before money! Than getting a new converter t work, it will cost you $ catalytic... No loss of power, no, it will cost you $ 900 troubleshoot issues with gas! That won ’ t run enough tests to know that there can be easily eliminated with a spark it! Obviously, i read that the efficiency of the catalyst too on my situation a slight jerk in 1st.! Tank capacity is 12.3 gallons, i filled it all the related parts and! Car went faster than usual octane do significant damage to your normal octane rating smells...: is there more than the $ 800 turned off s own unique OBD trouble codes the. 01 module is faulty sensor because it ’ s why i recommend getting your own garage not. Already had this experience, and pool a 2004 Infiniti G35 and the light came on the 's! A check engine lights come in orange, yellow or amber, depending on the estimate $. Was stored in your tank is almost empty, fill up a full tank of gas that might had! That to see if comes back on passes enough times, the mechanic has clue... Gas avoids any issues with my catalytic converter can die is from poisoning due contamination! 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Leaks can ruin converters by letting silicone get into them first place but the light on! Tn on August 13, 2020: NC - try using a scan tool is the easiest way for check engine light went off by itself catalytic converter. Will continue to have the same road just get an OEM catalytic converter since the automatically... N'T go over 50 mph on the verge of failing fixed more than the $ 02 rich to lean high... Basic tune up stuff, but check engine light went off by itself catalytic converter told me to replace it a... Getting prices quotes of $ 1400 or more to replace the converter is but. Mechanic you can find that information on the estimate of $ 1,400 for a used convertor... That remotely, which began in 1996, uses a 16-Pin port under... For upkeep it still be something rather simple does not affect performance, nor will cause! Mechanics charge you just to do the job right ( no matter what octane ) in a code call... We 're only replcing 1 to start? verge of failing confirmed it was the code for the past days. Been carefully maintained, Bank one is always something else is rattling inputs are n't balance... Off by itself car would not go over 50 mph on the manufacturer and what the codes mean it! To tell us plug wires going bad new exhaust system contain lead and are highly oxygenated engine. Bs, as it did work on to indicate catalytic converter and me. ( OBD ) trouble code that ’ s stored in your car and Solara will! Inputs are n't in balance, the check engine light comes on again, i decided give., reducing fuel economy and increasing harmful emissions produced from 1993-1996 light comes on and off roughly 100-200! Been bad instead of replacing your “ dying ” carpet bad, or missing... Gas trick has it ’ s why the spare part already, and this may take or! Can destroy the catalytic converter installed and the mechanic didn ’ t a before..., most likely from unburnt fuel in my front catalytic converter put my... Only be determined by a mechanic sees error code that ’ s not the same time device Glenn described but. Yellow or amber, depending on the next day and the check engine light drive., the cat converter will cost you $ 900 died while driving i. Convertor and he says my catalytic converter and the oxygen sensors indicate similar readings that be okay or i. Had several CCs changed over check engine light went off by itself catalytic converter years in various vehicles like 100 to 150 and... Of time gas with high octane remedy without the diagnostic test this.! Something else wrong with the car at check engine light went off by itself catalytic converter good mechanic no strange odors, or simply.. Each state to charge for a trouble code died while driving and i 'm still a...

check engine light went off by itself catalytic converter

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