1997 Ford F-150 2 OBD codes

Tiny
JOHN KAHLE
  • MEMBER
  • 1997 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
I've got two codes. One is PO303, (Cyl 3 misfire detected), and PO171, ( System too lean bank 1) What should I look at 1st?
Monday, August 30th, 2010 AT 5:32 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0303-check the sparkplug/comepression and injector for no.3 cyl.

P0171

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.
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Monday, August 30th, 2010 AT 6:48 PM

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