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1999 Ford Windstar codes

Tiny
KTUCKYMAN
  • MEMBER
  • 1999 FORD WINDSTAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
I scanned and these 2 codes are PO171 syetem adptive fuel too lean bank 1 PO174 system adaptive fuel too lean bank 2 What does that mean How can I fix it Thank You
Tuesday, December 1st, 2009 AT 5:31 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Tuesday, December 1st, 2009 AT 5:34 PM

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