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P0420 Catalyst System Effici

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Old 10-29-2008, 09:56 AM
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Default 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?
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Old 10-29-2008, 10:11 AM
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yea just do the fix you should be fine
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Old 10-29-2008, 03:50 PM
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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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