Quote:
Originally Posted by 19bonestock88
Car is throwing an 0420 code, you know, “catalyst efficiency below threshold”... it runs in closed loop though and over 95% of the time runs totally fine
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If it's P0420 then replacing the other piping won't fix it; it needs a replacement catalytic. You could probably try cleaning it too. RockAuto has good prices on aftermarket catalytics, or you could just straight pipe it with an O2 fooler.