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# Post Title Result Info Date User Forum
Answer to: Catalyst efficiency code   48Relevance 2 years ago Chuck Tobias Submit Your Question HERE
  Does the sensor test as bad? You did not state the code number but presumably it is p0420. There are quite a few things that can cause that code, including exhaust leaks.
Answer to: 2006 Pontiac Grand Prix still getting P0420   48Relevance 4 years ago UnknownLegend Submit Your Question HERE
  ... solution other than paying a lot for an OEM catalytic converter. It was $9 and easy to install, there are many videos on YouTube showing how its done. The p0420 Code p0420 95% of the time is caused by a clogged, worn out, or non existent catalytic converter. In rare cases it can be triggered by a bad O2 sensor or exhaust leak. What I suggest before replacing any parts is to install this spacer, it will tell you right away if the catalytic converter is bad or not (P0420 will not return), and if you want to leave the problem fixed for $9, you can! New P ...
Answer to: Check Engine Light comes back   41Relevance 3 years ago Chuck Tobias Submit Your Question HERE
  There are many things that can cause a p0420 code, including but not limited to a bad catalytic converter. Has your mechanic checked the items listed and taken the diagnostic steps detailed below?
Answer to: P0420, P0430   41Relevance 2 years ago Chuck Tobias Submit Your Question HERE
  Your best option is to follow the troubleshooting steps for those codes. (P0420 and P0430 are the same issue on different banks of the engine, so look for a common cause for both.)
Answer to: Tacoma trouble light P0420 Catalyst system efficiency   41Relevance 5 years ago Whatchamacallit Submit Your Question HERE
  p0420 does not always mean the catalytic converter is the root cause. You have to do the proper diagnostics and confirm (or rule out) that it is the catalytic converter. For that start here:
Answer to: Intermittent P0430 Code Bank 2   34Relevance 2 years ago Chuck Tobias Submit Your Question HERE
  P0430 is basically the same as p0420 but on engine bank #2:
Answer to: Should I replace the catalytic converter   34Relevance 3 years ago Whatchamacallit Submit Your Question HERE
  p0420 does not always mean the catalytic converter is the root cause. You have to do the proper diagnostics and confirm (or rule out) that it is the catalytic converter. For that start here: Videos here:
Answer to: Misfires, CEL, engine lost power   34Relevance 1 year ago Chuck Tobias Submit Your Question HERE
  What codes were present at that time? Possibly. Test it with a back-pressure gauge. Have you looked up the potential causes for that code? While bad plugs can be a factor (check them), there are other possibilities that are more likely. Troubleshooting information can be found in the links below: Also, when posting please do not click on the submit button multiple times. The site appear slow to respond but in fact it has processed your post immediately. You accidentally posted this topic five times. Please be patient. Thank you.
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 2 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: How do I fix DTC P0420   34Relevance 4 weeks ago Chuck Tobias Submit Your Question HERE
  The p0420 code has been discussed quite a few times here, so you may want to use the site search function and see the troubleshooting section of the site FAQ. While that code commonly refers to a failed catalytic converter there are other potential causes that should be explored. See the following: As far as where Bank 1 is located, that is the first bank of cylinders - the only bank of cylinders if you have an inline engine.
Answer to: P1233 and P0420 codes   34Relevance 5 months ago Chuck Tobias Submit Your Question HERE
  P1233 has to do with the electronic throttle body. You could try cleaning it with the appropriate spray cleaner in case it's sticking a bit: p0420 usually means your catalytic converter is bad but there are other possible causes. See diagnostic information for in the links below:
Answer to: How to fix code P0420   34Relevance 9 months ago Chuck Tobias Submit Your Question HERE
  Is your engine burning oil and damaging the converter? Did you check out the other possibilities that can cause p0420 the last time?
Answer to: 2009 Subaru Forester P0420   34Relevance 2 years ago Chuck Tobias Submit Your Question HERE
  It may not be a cat at all, there are numerous other possible causes for p0420.
Answer to: 2010 Volvo XC60 T6 Showing P0420   34Relevance 2 years ago Chuck Tobias Submit Your Question HERE
  Have you checked into the possible causes of p0420 other than the converter and O2 sensors? That's a common code, if you search the board and check the FAQ you'll find a lot of information. Also, it would be best to stay away from dealers and find a good independent mechanic.
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