Quote:
Originally Posted by trevorovert
Sooo.. what if you have a ROM that disables that CEL?
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You win!
Disable P0420 and you will never fail in inspection.
For those of you wondering, this is the catalyst efficiency code you receive when running a catless header and the flow matches both O2 sensors equally. Disable this code and your car will love you too. No more richness and pulled timing.