Well hello again. Glenn Stok (author) from Long Island, NY on December 02, 2019: Egbert Mntungwa - If you are asking about using standard gasoline—NO! There are two of them, one before and one after the catalytic converter. The mechanic has no clue either what it means. Dora Weithers from The Caribbean on October 06, 2017: Very helpful, useful information, although I would engage someone else to help me follow the instructions. You probably need to replace it as a combination single unit. Another shop told me it was my Bank 2, 02 sensor downstream, passenger side on my 02 Nissan Pathfinder converter but the shop doing the repairs said Bank 2 is the engine side. Do you feel if those three things were replaced, that your high octane trick would clear the catalytic converter of the unburnt fuel remaining? I would have 2 push in the clutch and keep revving it up. 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. Such as: At least you’ll know for sure that you ruled out contamination, which I found to be quite common among my friends who saved money by following my method. You’ve got time, don’t you? As a mechanic that's fixed more than 8,000 cars, I decided to give TOAD OBD a try. The safest thing is to get an original manufacturer brand or one that is legal for all 50 states. In a couple of weeks, I used up half the tank. If it continues to stay off, you’ll know it was only a contaminated catalyst system. Any suggestions? Octane is a rating of resistance to detonate and the higher the octane, the higher the resistance to detonation, the exact opposite of what you said. 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. I read on another post to add two cans of Seafoam to the tank when it's half full. It worked for me. When my check engine light came on, I read the OBD trouble code that was stored in my car’s computer. If I can't figure this thing out I will try your trick with the RTV as I have to take the smog test soon. Luckily I found your page, and diligently followed your advice. They won’t match if the catalyst system is within a proper threshold. As a Toyota Specialist I was wondering if you could maybe help me understand something? long time gone is when you could tie a pair of tights round the watsit! Paying under $40 for your own scanner is a lot cheaper than $1000 for a replacement you may not need. I explicitly told the mechanic I wanted a new converter installed which he agreed to. That can reduce the efficiency of the catalyst too. Unfortunately, i didn't see this until I replaced my CAT. A converter reduces pollution through chemical reactions that require fuel (from the unburnt gas in your exhaust stream), heat (from your exhaust), and oxygen. Your old vehicle may fail to pass the required smog test. Thank you so much for any help. 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. You simply cleared the contamination and helped your car’s catalyst system perform to required specs again. can a clogged catalytic converter unclog itself? Your check engine light would be on if you have any emissions issues, in which case you can read the OBD code to see what it is. I use a low-cost diagnostic tool to see the vehicle’s check engine light OBD error codes. 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 … Gas cap issues can reduce fuel pressure and allow fuel vapors to escape, reducing fuel economy and increasing harmful emissions. That usually is the case when people continue to have problems afterwards. It’s too late to try my method. Hoping that it will clean whatever was causing the light to go off out. Change an oxygen sensor on your 2000 Dodge Stratus without leaving behind damaged threads and exhaust leaks. Possibly with one of the O2 sensors. However, my method only works if the catalytic converter is malfunctioning due to contamination, as I just indicated. My car would not go over 50 mph on the highway. Glenn Stok (author) from Long Island, NY on December 04, 2018: Mozee - You should report that machanic for fooling you. Did I, a 63 year old female got ripped off! It will never pass inspection. You’ll save yourself a trip. I discuss the reasons why. It is not recommended to drive the vehicle if the check engine light is flashing. I didnt get the device Glenn described, but my light went off on its own with the high octane gas like Glenn described. It cost me hundreds! I drive a 2006 Jeep Liberty. Another mechanic sent this other converter trick to me, and I tested it today and it did work. I feel that he hasn’t run enough tests to know this is what it needs for sure. It could be the other one that's bad, or it could be the catalytic converter itself. Glenn Stok (author) from Long Island, NY on March 23, 2019: Leroy polczynski - It looks like you were screwed. Fingers crossed that I’m in the clear because inspection is next month and a new cat converter will cost me $1100. It is there to control emissions pollution. 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. Even worse, you need to have an annual inspection soon, and your vehicle won’t pass unless you get your catalytic converter repaired. Please help! 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. But that doesn’t necessarily mean you have a bad catalytic converter. They changed the catalytic converter and ordered me a new gas cap. Still working my way through the tank of premium gas. Then I got one O2 sensor replaced. You need to check with Toyota about your question if there is more than one. I have had several CCs changed over the years in various vehicles. Answer: Racing fuel is high octane. 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. In most cases you will receive a P0420 or P0421 code. It might have water in it that can cause a low efficiency reading. The infamous PCDS-9's compatibility problems can be easily eliminated with a total rewiring into Whelen's more versatile PCCS-9 system. In case you’re wondering, in recent years many cars have the catalytic converter near the engine so they heat up faster. There’s one on the front of the engine and one on the back. That’s why I recommend getting your own diagnostic tool as the one I mentioned in my article. My car no loss of power, no strange odors, or any rattle noises. Dealer changed them out now have the infamous cat code,p0240! Usually, an illuminated check engine light is the first and only sign of a bad catalytic converter. Glenn! If it’s a catalytic converter warning, this solution may help avoid repairs. OBD diagnostic scanner that I bought on Amazon. Here is a way to take the cheap Bosch oxygen sensor #15718, made for Ford cars, and use it on your 2.0 L Volkswagen engine. Question: I have a 2011 Chevy Cruze. Below we have highlighted the most common causes of a check engine light. So you should have your mechanic put your car on the lift and eyeball the situation. Hi Glenn, my 2006 Sienna engine light came on last month, OBD scanner displayed P0430 (catalytic converter bank 2). That might also be a result of a severely damaged catalytic converter that needs to be replaced. 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. I called a spare parts dealer for a used catalytic convertor and he asked WHAT MANIFOLD THE CONVERT WAS. Its purpose is to reduce emissions from the exhaust with an efficiency level required by each state to control pollution. The engine light comes on and off roughly every 100-200 miles i drive. I received the code stating to change catalytic converter. As for the recalls, you need to know the OBD code to determine why the check engine light is on. Is the carpet in your car faded or stained? Question: Is there a diagnostic tool for this year for my Chevy S10 V6 4.3L is a 1991 model? My 2008 Ford Expedition is giving OBD 304, 308, and 420. Now after about 4 days the light came back on with the code P0138. I do notice a rough idle at times and a slight hesitation when stepping on the gas. I never had a problem before using different gasoline. Glenn, thank you for your response! I used a fuel injection cleaner with the hope that it fixes the issue. Glenn Stok (author) from Long Island, NY on August 31, 2019: Maria - Same answer I just gave to Aimee Guidry below. Glenn Stok (author) from Long Island, NY on March 08, 2019: Stephanie Gordon - You may as well wait to see how it is after your trip with the high octane gas. If it doesn’t come back on that means I have a while. You could have an exhaust leak. I would hold off on the expensive replacement of the catalytic converter since the light went off on its own. 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. I first got a P0420 code two years ago after a cross-country roadtrip. After you’ve driven with high-octane for a couple of hundred miles, shut off the check engine light with the diagnostic scanner like the one I use. Question: Another cause of a P0420 can be spark plugs, ignition coils, or spark plug wires going bad. 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. Glenn Stok (author) from Long Island, NY on November 02, 2019: TN - Your Subaru has the catalytic converter integrated with the exhaust manifold. The P0420 sensor has gone on and off for about two years. Obviously, I am going to take it back. FlourishAnyway from USA on October 04, 2017: Extremely useful information, Glenn! 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. Most people think the only way to know for sure is to replace the catalytic converter, reset the check engine light, and see if it comes back on. After 11 months , the engine light reappeared and the mechanic says the other converter has gone bad and needed to be replaced. Answer: If you recently reset your check engine light or if you disconnected your battery, then the status of various sensors will indicate "not ready." Below we have highlighted the most common causes of a check engine light. Glenn Stok (author) from Long Island, NY on June 16, 2019: Sara S Mccroskey - Since you had recent work done, replacing the Catalytic Converter, you may have an opening in the intermediate pipe leading to the muffler if it wasn't done well. Great suggestion on the Red RTV. You can find that information on the sticker under the hood. The use of high octane generally works if no other issues are present. A check engine indicator is a malfunction-indicator light or MIL for the computer-management system. Now he is telling me i need to change the converter. I've been doing a lot of basic tune up stuff, but I'm wondering if my catalytic converter may be the problem. It's misleading as to why it works, as it did for me. Use A Scan Tool. Glenn Stok (author) from Long Island, NY on April 18, 2019: Stephanie - That all depends on what is causing the reading. I have a Subaru Liberty 2013. Well, it turns out silicone also kills oxygen sensors. If the light begins flashing, however, it indicates a more serious problem, such as a … I only replaced one so far. It's a lot cheaper than piecemeal repairs. That is, it ignites at a higher temperature. Glenn Stok (author) from Long Island, NY on June 12, 2020: Shailesh - I explain that in detail in this article. Is your DMV renewal date nearing? Know how to replace an oxygen sensor safely. Dipen - Check the diagnostic code with a scanner as I suggested. So I did the high octane gas thing...used full tank in 2 days... light still on, but more importantly, still having that jerky hesitation feeling when accelerating. Mechanic #1 said it was the cat and gave me a quote for an OEM part: $2500 because my car has CA emissions standards. I found an alternate solution that worked twice for me already, and it worked for a few friends who listened to me. Ive been driving it for about 2 years with the check engine light on. 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