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Trouble code P0171 --System too lean (Bank 1)

Tiny
HARDOG013
  • MEMBER
  • 2000 FORD F-150
  • 105,000 MILES
What does this code & discription mean
Thursday, November 10th, 2011 AT 10:50 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 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
  • MECHANIC
  • 75,992 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
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Thursday, November 10th, 2011 AT 11:47 PM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
The most common failure for this code is the PCV tube elbow on the back of the throttle body or on the valve cover, depending on which engine type you have.
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Wednesday, April 8th, 2020 AT 4:22 PM

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