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

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Yes,, a dirty MAF will always cause a fuel trim shift. Any time the MAF does not report properly, the fuel trim will show the problem, and if once the MAF gets bad enough, then the trims cannot chang... Login to read more.