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Re: Codes P0420 and p0430
Quote:
Originally Posted by danomano
Think I got it fixed after replace down stream O2 sensor and still get code and having the cats checked I did this to fix it.
I installed two 18mm no foul spark plug holders. One set I drilled out to accept the O2 sensor then screwed that into the stock one. After that I installed back into the exhaust and have not had an issue with it for two weeks. When before it would happen again after a day. Part number 42009 at autozone in the HELP section.
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If this is what fixed it, you just masked the problem. Chances are one of the issues in Clinebarger's post are killing the cats.:
"Check for exhaust leaks.
Things that can degrade the catalyst itself..
An engine misfire
High engine oil or high coolant consumption
Retarded spark timing
A weak or poor spark
A lean fuel mixture
A rich fuel mixture "
__________________
1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec
-Gibson Stainless Cat Back Swept Side
-SS Wheels
2005 Honda CRF250R
2006 Honda CRF150F
Last edited by bwood; 11-12-2010 at 01:58 AM.
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