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p0420
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  1. The 02-09 "How-To" and DIY Section
    Sorry if I missed it somewhere else but I have searched this and other forums and no luck with actual answers. Just many people with a lot of questions. Codes - P0420, P0430 Did have one for MAF sensor but cleaned it, cleared codes with OBDII tool, and even left battery unhooked for about 30...
  2. OEM Issues
    The wife's 2004 LS is having issues stalling out while driving and when stopped at lights, both issues are intermittent and doesn't happen on every trip. I pulled the codes and it has P0171 and P0420, what stumps me is the fact that P0420 is not supposed to be able to run if P0171 is set: DTC...
  3. The 02-09 "How-To" and DIY Section
    I have an 05 tb Lt, last week it started running really rough. It's like the transmission won't keep up with the engine. Especially up hill, it struggles to rev up like it should. It will not get up and go. I had three codes show up. P0420 p0496 and p0014. Now a lot of ppl that had the code...
  4. General
    After replacing my sparkplugs (proper plugs and gap) and the catalytic converter, a few drive cycles later (about a week) I get a check engine light with code P0420.. I'm assuming they may have installed the wrong cat as this code states "inefficient cat.." So perhaps it was a "universal" that...
  5. OEM Issues
    Okay, i have been reading these forums for several years and they have been a huge help in diagnosing and fixing the issues that my 02 TB has presented... until now. This is going to take a little bit to explain so bear with me. About a year ago, i had some missfire issues and ended up...
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