Notifications
Clear all
Search result for: p0420
| # | Post Title | Result Info | Date | User | Forum |
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 28Relevance | 5 years ago | Whatchamacallit | Submit Your Question HERE | |
| For p0420 start here: | |||||
| RE: Tune up | 21Relevance | 6 months ago | Chuck Tobias | Submit Your Question HERE | |
| There is no "quick fix". As I said look up the codes, potential causes, and troubleshooting information. Here are some to get you started: | |||||
| Answer to: what is the best catalytic converter cleaner | 21Relevance | 8 months ago | Chuck Tobias | Submit Your Question HERE | |
| If you've already tried various snake oil products another is very unlikely to do anything but further lighten your wallet. Have you done any troubleshooting to check for other possible causes aside from the converter itself? Although the catalytic converter is the most common, there are other potential causes worth investigating. | |||||
| Answer to: Catalytic converter issues | 21Relevance | 10 months ago | Chuck Tobias | Submit Your Question HERE | |
| We advise replacing parts only if they test as being bad. (Guessing and loading the parts cannon rarely if ever produces a good result.) See the possible causes of and troubleshooting information for that code in the links below: It does appear you are running a bit lean if your long-term fuel trim is +8 to +12, though it's not too horrible for a 20-year-old high mileage car. You might want to check for vacuum leaks. | |||||
| Answer to: CEL PO420 @ low rpms, stays off @rpms | 21Relevance | 1 year ago | fishingandcarsenthusiast123 | Submit Your Question HERE | |
| Also this article has a lot of info about p0420 codes. Hope this helps! Article link: | |||||
| P0420 on Mercedes w204 4 cylinder petrol engine | 28Relevance | 5 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: Chevy sonic sounds like a semi | 21Relevance | 3 months ago | Chuck Tobias | Submit Your Question HERE | |
| The first 3 codes all refer to cooling system temperature and thermostat problems. If you're lucky the cause is just a bad thermostat. P0131 indicates a problem with your upstream O2 sensor or its circuitry: P0171 indicates a lean condition. (This may be related to the problem being flagged by P0131.): If you are going to replace the O2 sensors hopefully you have purchased OEM parts from a trustworthy source. Aftermarket knockoffs have a high probability of not working properly and there are a lot of counterfeits around, particularly at eBay and Amazon. There is nothing here indicating a water pump problem. Usually those would make noise or weep coolant if they're going bad. Is there play or roughness in the water pump bearing, or is it leaking? (It's also possible for the water pump impeller to come loose or corrode, but that is less common and you would be experiencing overheating problems if that were the case.) p0420 is usually the catalytic converter but there can be other causes that should be checked out: You can use a back pressure gauge to check if the converter is clogged. Since you have codes there should be freeze-frame data. You might want to check for that as well as live data for issues. | |||||
| Chevy sonic sounds like a semi | 21Relevance | 3 months ago | BaileyWalker337 | Submit Your Question HERE | |
| Hi, I have a 2017 Chevrolet Sonic LT, 1.8L 4-cyl (MFI DOHC) with 131,828 miles. I’ve owned it since about 54,000 miles (around 5 years). It’s currently throwing the following codes: P0597 P0128 (appears 3 times on my scanner) P2181 P0131 P0171 p0420 The car has had p0420 (low catalyst efficiency) for a long time. More recently it has been idling rich, smelling like fuel, and running louder than normal. On my most recent drive it lost a lot of power, backfired on deceleration, and became extremely loud under acceleration (almost like a semi truck ... | |||||
| Answer to: 2012 Honda CRV Code PO420 | 21Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Have you looked up the possible causes of that code and diagnostic procedures? | |||||
| Answer to: P0430 | 21Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Did you troubleshoot the various items that can trigger the p0420/P0430 code aside from the catalytic converter? (Both codes refer to the same fault but in different banks.) | |||||
| Answer to: Car white smoke | 21Relevance | 11 months ago | Chuck Tobias | Submit Your Question HERE | |
| White smoke is likely an indication of head gasket failure and that could have contaminated your catalytic converter or O2 sensors. While your converter could be shot there are other possible causes for p0420. However first you should probably check for head gasket failure. Also, please note that you accidentally posted this topic four 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 ... | |||||
| Answer to: 2016 Cx5 touring p0421 | 21Relevance | 1 year ago | Chuck Tobias | Submit Your Question HERE | |
| Did any of those parts test as being bad or were you just loading up the parts cannon? Did you install OEM parts? You can find diagnostic information for P0421 in the link below. That code is similar to p0420: Also see this TSB for 2014-2016 Mazdas and P0421, check your VIN to see if your vehicle is listed as affected: | |||||
| Answer to: 2003 camry not starting | 21Relevance | 1 year ago | fishingandcarsenthusiast123 | Submit Your Question HERE | |
| Have you checked for other possible causes of this code? Check to see if your fuel filter is clogged. If not pressure test your fuel system (at the rail) and the fuel pump itself. Chances are your fuel pump is starting to fail. You failed to mention the mileage on your car but being that its 22 years old chances are something in the fuel system is worn out. For more info about troubleshooting a no-start condition, see the FAQ | |||||
| Answer to: Loss of power with P0430, P0471, P0299 codes | 21Relevance | 1 year ago | Chuck Tobias | Submit Your Question HERE | |
| Have you looked up the potential causes of those codes (P0420 and P0430 are the same for different engine banks)? Also, in the future when posting please use the subject line for a short description of your topic, not the full details which belong in the body of your post. Thank you. | |||||
| Answer to: Will an aftermarket catalytic converter work? | 21Relevance | 2 years ago | Hixster | Submit Your Question HERE | |
| ... have the longevity of factory units. Your CEL is being triggered to alert you of an issue, it doesn't define it. If your cat is clogged up, something caused this and that's what you need to fix. Otherwise you'll be right back in the same situation regardless of the 'type of CC' you install. It's important to note there are more causes for a p0420 than just a bad cat: | |||||
Share: