Quote:
Originally Posted by Terminator03
I didn’t say they NEVER go bad, just that they typically last well over a 100,000 miles, barring any engine issues causing early demise such as the examples I mentioned. I actually had one go bad at 60k miles due to a coil related misfire on another vehicle. My intent was to not have the OP just throw an expensive CAT replacement on without doing due diligence, as it could very well be something much simpler, and cheaper to repair.
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You're right, you didn't say "never", you said "only." Which in context of the conversation, means the exact same thing.
Quote:
Originally Posted by 2003-4x4runner
I had the same issue and I tried CAT clean and it helped out for awhile. I also replaced all the Co2 sensors. 6 months later, the PO420 code came back and it wouldn't go away. So I ended up buying a new CAT and I haven't had any issues since and that 2 years ago. Parts and labor was $1000.00 at a local shop in Nor Cal.
If you do a search on T4R, you'll find that this issue seems to be common on the 4th Gen V6. Good luck.
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I believe this proves my point.
I'll never understand why some on this forum believe that catalysts don't fail and resort to replacing known good parts as a solution. The stigma and false information about P0420 and P0430 codes around here is rampant.
