2000 Ford F-150 Repair Question
Topics covered: Sensor, Vacuum leak, Fuel injector.
Mileage: 105,000 miles.
Mileage: 105,000 miles.
Asked on November 10, 2011
Trouble code P0171 --System too lean (Bank 1)
What does this code & discription mean
Asked by hardog013Answer
Replied on 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...
Replied on November 10, 2011
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
