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 Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
First diagnose P0171 FORD code
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 terminals.
P0171 FORD Tech NotesIf the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persistss the front oxygen (O2) sensor may need to be replaced.
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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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 labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
When is the P0171 FORD code detected?- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
P0171 FORD Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0171 FORD MeaningWith 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 FORD More InformationNeed more information on how to fix the P0171 FORD code?
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P0171 FORD 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