P0171 FORD - Fuel Injection System Too Lean Bank 1
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
It's a very common problem for the Ford Windstar. Link to a website with information on how to repair: 1999-2003 Fords Windstar Code P0171
2004 FORD F150 P0171, P0174, P0301, Misfire and Lean Condition
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- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
- Excessive Fuel Consumption
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).
P0171 1997 FORD F150
P0171 1998 FORD F150
P0171 1999 FORD F150
P0171 2004 FORD F150
P0171 2005 FORD F150
P0171 2006 FORD F150
P0171 2007 FORD F150
P0171 2008 FORD F150
P0171 2009 FORD FOCUS
P0171 2011 FORD FOCUS
P0171 2006 FORD FUSION
P0171 2007 FORD FUSION
P0171 2008 FORD FUSION
P0171 2010 FORD FUSION
P0171 2012 FORD FUSION
P0171 1999 FORD WINDSTAR
P0171 2000 FORD WINDSTAR
P0171 2001 FORD WINDSTAR
P0171 2002 FORD WINDSTAR
P0171 2003 FORD WINDSTAR
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Any information is appreciated. Thanks