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

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

by in Flower Mound, TX on November 30, 2010
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1 answer 1 comment
ANSWER by , November 30, 2010
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 Roy
COMMENT by , November 30, 2010
Thanks Roy, I'll get it checked out, hopefully they'll start with the least expensive possibilities first!