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Q: 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?
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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

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