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Discussion Starter · #1 ·
Ok, ECU failure 2mths ago, replace, soon after CEL came on, p0420....turned it off, came back with p0420 & p0430.

Tried easy fix, cleaned MAF, changed plugs. Also have scanned it, O2 sensors are responding/working properly, says bank 1 & 2 are running rich, so imagine it means both cats are shot....due to ECU failure. Right?

My plan was, unbolt before cats, hollow them out, bolt it up, turn the O2 sensors off (tune) and go on my way.

So where lies fault within this plan?
 
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