Geting code PO171 & 174, no vacum leaks.

Tiny
ANONYMOUS
  • 2004 FORD FREESTAR
  • 150,000 MILES

Geting code po171 & 174, no vacum leaks, several mass air sensor replaced, new plugs and wired, new fuel filter. What could cause this lean reading, could it just be a bad sensor sending low voltage reading to computer. Thank you for any help with this

Tuesday, March 12th, 2013 AT 4:24 AM

1 Reply

Tiny
CARADIODOC
  • EXPERT
  • 27,690 POSTS

Common cause of code 171 is the EGR valve.

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Tuesday, March 12th, 2013 AT 4:29 AM

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