1999 Ford Windstar to lean

200,000 MILES • 6 CYL • FWD • AUTOMATIC
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JOEBME
  • MEMBER
  • 1 POST
obd codes P0171-P0174 to lean on banks 1 and 2 . how do i fix this?
Aug 10, 2010 at 3:11 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen Sensor.
Aug 10, 2010 at 3:34 PM
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