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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

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