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2001 Ford Explorer Sport Trac Question: check eng light codes P171, P174



, Flower Mound, TX, November 30, 2010, 11:17

I guess codes 171 and 174 together could signal an MAF sensor fault. Any experience with this problem?

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  • Answer #1

    November 30, 2010, 12:00

    yes, the maf could be but there are other common areas as well. the orings on the upper intake leak when cold causing the same codes. a bad pacv valve will do it as well as incorrect fuel pressure. a smoke test will eliminate the o rings being the issue. fuel pressure check will tell the story on fuel delivery


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    , November 30, 2010, 15:26

    Thanks Roy, I'll get it checked out, hopefully they'll start with the least expensive possibilities first!

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