TROUBLE CODE P0171 --SYSTEM TOO LEAN (BANK 1)

  • Tiny
  • hardog013
  • 2000 Ford F-150
  • 105,000 miles

What does this code & discription mean

Thursday, November 10th, 2011 AT 10:50 PM

2 Answers

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

The air fuel ratio has more air than it should and not enough fuel. It could be the result of an O2 sensor, a vacuum leak.

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Thursday, November 10th, 2011 AT 10:52 PM
  • Tiny
  • rasmataz
  • Member

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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Thursday, November 10th, 2011 AT 11:47 PM

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