P0420 Catalyst System Effici

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Oct 29, 2008 | 09:56 AM

albe

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P0420 Catalyst System Effici

What is it? i just install my exhaust with a test pipe with cel fix but do i need to do the Antifouler fix under DIY?

Oct 29, 2008 | 10:11 AM

driftintherain

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From: PA

yea just do the fix you should be fine

Oct 29, 2008 | 03:50 PM

Slows2k

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From: Mother F'in TN

If you just put on the test pipe it's from that.

does the test pipe have a spacer for the rear 02 sensor?

If not, get a spark plug anti fouler and drill it out like the

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