Quote:
Originally Posted by prybar
I've had the P0420 code ever since I got my 4R. It comes and goes and I usually don't bother doing anything about it anymore. I replaced the O2 sensor and the other typical things, but it will usually pop up on long, slow drives at high outside temps. About 6 months ago (right before smog) I drove for about 2 hours on the freeway with O/D off at a high RPM to heat up/clean my cats. Worked like a charm and haven't seen the code since (although I know it's not fixed). But it's an option I suppose.
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Alright, thanks, I will keep that in mind as a potential resolution if I'm dealing with this when I have to get smogged! Sort of want to take it to smog just to see whats actually coming out of the tailpipe.
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