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Re: 2:31:47 P0420: Keeping the Light Off with 'G' Jerry Truglia
Posted to Technical Tips Forum on 1/27/2016

Good point, I Found that many Fords will also set similar codes when the problem is really a dirty MAF. I usually check the MAF first and go for a test drive before getting too excited about hunting down the other codes because they could just be ghosts of the... Login to read more.