1997 Ford Explorer emissions

Tiny
JEANHERRICK
  • MEMBER
  • 1997 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
I have a code coming up PO171 and PO174
We replaced the mass air flow sensor and the check engine light came back on. What else to you think these codes could mean? The vehicle runs great.
Saturday, January 19th, 2008 AT 9:02 PM

1 Reply

Tiny
FLEXY5
  • MECHANIC
  • 512 POSTS
You have a vacuum leak somewhere. Check vacuum hoses (especially the pcv hose) and intake gaskets.
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Saturday, January 19th, 2008 AT 9:20 PM

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