P0171 FORD - Fuel Injection System Too Lean Bank 1
P0171 FORD Possible Causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Positive Crankcase Ventilation (PCV)
- Faulty Mass Air Flow (MAF) sensor
- Incorrect PCV hose connection
How do I fix code P0171 FORD?Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Link to a website with information on how to replace the Intake Plenum Gasket and seals:
1999-2003 Fords Windstar Code P0171
There is Factory Service Bulletin for the following Ford Models:
2009-2010 Ford F-150
2009-2011 Ford E-150
2009-2011 Ford E-250
2009-2011 Ford E-350
2009-2011 Ford E-450
2009-2011 Ford Expedition
2011 Ford F-250
2011 Ford F-35
Ford Factory Service Bulletin OBDII Code P0171
2004 FORD F150 P0171, P0174, P0301, Misfire, and Lean Condition
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Cost of diagnosing the P0171 FORD code
Labor: 1.0The cost of diagnosing the P0171 FORD code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
When is the code detected?- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0171 FORD DescriptionWith 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).
More InformationNeed more information on how to fix the P0171 FORD code?
Get Access to Factory Service Manuals
Information for specific Ford models
- P0171 2003 FORD ESCORT ▶
- 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
Need more help?Get the P0171 Ford code diagnosed by a professional: Find a repair shop in your area
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