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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: 2004 Toyota Camry SE P0420 | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| While it is possible you have a bad catalytic converter don't overlook the other possible causes for that code. | |||||
| Answer to: P0420 | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| You might want to check the other conditions that can trigger that code. | |||||
| Answer to: PO420 code AFTER turbocharger and pcv/intake manifold, valve cover replacement | 34Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Have you looked up the various conditions that can trigger the p0420 code and how to diagnose it? The problem isn't necessarily the converter itself. The fact that this code popped up after having other work done on the exhaust system suggests a different cause - especially if the shop was so incompetent it took them 3 tries to install a turbocharger. (Hopefully you haven't done too much damage to your fuel system by pouring in so much of that crap into the tank. Using Marvel Mystery oil in your fuel is not a good idea either.) | |||||
| Answer to: Hesitation to accelerate 2004 Toyota Highlander | 34Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| What kind of dealer is selling 20-year-old cars? Is anything known about its service history? Wasn't this problem discovered during the pre-purchase inspection? Is there anything suspicious in live data? Although p0420 frequently is caused by bad catalytic converters there are other issues that can trigger it. See the following for possible causes and diagnostic procedures: | |||||
| Answer to: P0420 | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Have you checked the other possible causes of the p0420 code? | |||||
| Answer to: CODE P0420 2016 honda accord | 27Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| That depends what is actually causing the code. (Of course the code points out a condition rather than a specific part.) What kind of diagnostic steps did the dealer take to determine the cause, and what did they say the problem is? Here's some troubleshooting information if you'd like to so some of your own checking: Also be aware that the dealer is the most expensive option and necessarily the most competent or thorough at diagnosing problems. You'd be better off finding a good independent mechanic for any non-warranty work. (Avoid chain shops such as Pep Boys, Firestone, and Midas as well.) | |||||
| Answer to: Murano P0420 | 27Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| Did you look up the code to see what the causes for it might be? Codes are only a starting point for diagnosis, they tell you a condition exists but not necessarily what it actually at fault. | |||||
| Answer to: P0420 | 27Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| Why did you do a "lacquer treatment"? Have you done any troubleshooting? p0420 is very common code with several possible causes other than the converter itself. (Codes only tell you that a particular condition exists, not what specific part or parts are causing the problem.) | |||||
| Answer to: Tacoma trouble light P0420 Catalyst system efficiency | 27Relevance | 4 years ago | MountainManJoe | Submit Your Question HERE | |
| cat.con. may just be worn out | |||||
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 27Relevance | 5 years ago | Whatchamacallit | Submit Your Question HERE | |
| For p0420 start here: | |||||
| Answer to: GS 350 cel on and mild knocking idle | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Since you are seeing essentially the same code for each engine bank it is likely something that is affecting both sides of the engine. See the following links for potential causes of p0420/0430 and diagnostic procedures: | |||||
| Answer to: Should I straight pipe my exhaust? | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Did you look up the various potential causes of that code? It may not be your catalytic converter. You need to do more diagnosis before taking action. | |||||
| How do I fix DTC P0420 | 27Relevance | 3 years ago | ben.gau986 | Submit Your Question HERE | |
| ... O2 sensors were not, and were all fouled thanks to the excessive engine oil that was burned. After my engine was replaced, I replaced the sparkplugs and cleaned the O2 sensors. After all of that, my car ran much better, but it did have a decrease in power that seemed to get worse over time, the mpg was also not where it should have been. After months of a recurring p0420 code, and gas mileage of only 12-18mpg, I decided to suck it up and replace both O2 sensors with replacement ones from Denso. This only solved my check engine light for a day or two, bef ... | |||||
| P0420 on Mercedes w204 4 cylinder petrol engine | 27Relevance | 6 years ago | Evil1nside | Submit Your Question HERE | |
| Hello Scotty and forum, I have a C200 Kompressor from 2008(w204) m271 engine.The car has around 200.000 kilometers, it's manufactured in Germany, and so far so good, I had next to no issues with the vehicle what so ever. My scanner reports the following error: ============1==============P0420Raw code: 0420ECU: Engine control unitStatus: Test has not been completed, Validated and stored in non volatile memory, Validated fault has been present during this drive cycleOBDII: Catalytic converter system, bank 1 - efficiency below threshold ============2==============P0420Raw code: 0420ECU: Engine control unitStatus: PendingOBDII: Catalytic converter system, bank 1 - efficiency below threshold ============3==============P0420Raw code: 0420ECU: Engine control unitStatus: ConfirmedOBDII: Catalytic converter system, bank 1 - efficiency below threshold Should I go ahead and replace the O2 sensor in bank 1 before the catalyst, or is there a good known way to verify if it's just a faulty sensor, a leak on the exhaust somewhere, or a bad catalyst? Thank You. | |||||
| Answer to: MY 2003 Honda Accord Coupe with 239,000 miles | 27Relevance | 1 year ago | Chuck Tobias | Submit Your Question HERE | |
| 1. Is there a question? If so a clear, concise description of your car problem belongs in the body of your post. There appears to be a partial attempt in the tags with most of it cut off since that's the wrong place. About the only intelligible part is "P0420". If you search for information on that code you will find there are a number of possible causes including, but not limited to, bad catalytic converter. 2. The title line should be used for a short description of your topic, not your vehicle description. (Title edited to reflect the OBD2 code found in the tags.) 3. For some reason, your browser is generating several duplicates when you submitted your post. (You accidentally posted this topic 4 times.) Are you having network issues? If so, then please wait until you have a stable connection. If you are pressing the submit button more than once, please stop. Press it once, and wait for it to finish processing. Otherwise it creates more work for moderators to clean up, and eventually the system will automatically ban your from entering. Thank you. | |||||