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Re: 97, 98, 99 FORD EXPLORER 4.0 DTC'S PO171 AND PO174.
Posted to Technical Discussion Forum on 12/24/2003 3 Replies

John,

Remove the mass air flow sensors to see if they're dirty. They're held in their housings with two security Torx screws. Dirty MAFs and P0171-174s go together. HTH, Login to read more.

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