Mechanics

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

2000 Ford F-150 • 105,000 miles

What does this code & discription mean
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Hardog013
November 10, 2011.



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.

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

Rasmataz
Nov 10, 2011.