Ford Expedition 4x4

1998 FORD EXPEDITION
164,000 MILES • V8 • 4WD • AUTOMATIC
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SCOOBY-DOO$
  • MEMBER
  • 2 POSTS
check engine light is on. Had it put on scanner and it said running lean on bank1 and bank2.was told O2 sensors,so I replaced all 4. No luck had code cleared and came back on.
Nov 30, 2010 at 12:34 AM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
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.
Nov 30, 2010 at 12:37 AM
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