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2001 Ford Expedition PO171

Tiny
01EXPEDITION
  • MEMBER
  • 2001 FORD EXPEDITION
  • V8
  • AWD
  • AUTOMATIC
  • 11,100 MILES
After my check engine light came on, I went to Autozone and they told me the code was PO171. After doing some research, I was led to believe it was the DPFE Sensor. I purchased one and put it on, but the engine light is still on.

Do I have to reset the codes before I can really see if I solved my issue - because the Check Engine Soon light is still on? Can I do this by disconnecting the positive battery cable for 15 minutes?

Did I replace something I shouldn't have?

HELP - Rob
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Friday, February 5th, 2010 AT 7:06 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
P0171 is a lean code, probably a vacuum leak, Fords tend to leak at the PCV rubber elbow, check it with spray TBI cleaner, if the idle changes, you found a leak. Do not spray on exhaust manifolds! Ford sells the elbow.
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Friday, February 5th, 2010 AT 7:17 PM

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