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P0171 2007 Ford F150 Code - Fuel Injection System Too Lean Bank 1

- Code Popularity: 15,249 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By AutoCodes.com - Updated Jul 20, 2022
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|Code P0171 2007 Ford F150 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 the Code P0171 2007 Ford F150?

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.

Does your Ford have Safety Recalls? → Check here

|Code P0171 2007 Ford F150 Tech Notes

If 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 persists the front oxygen (O2) sensor may need to be replaced.

2004 FORD F150 P0171, P0174, P0301, Misfire and Lean Condition





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|What is the Cost to Diagnose the Code P0171 2007 Ford F150?

Labor: 1.0

The cost of diagnosing the P0171 2007 Ford F150 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|When is the Code P0171 2007 Ford F150 Detected?

- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

|What are Code P0171 2007 Ford F150 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Excessive Fuel Consumption

|Code P0171 2007 Ford F150 Description

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).

OBDII Code P0171 2007 Ford F150 - Fuel Injection System Too Lean Bank 1 - AutoCodes.com
P0171 2007 Ford F150 Code - Fuel Injection System Too Lean Bank 1

|Need More Information on the P0171 2007 Ford F150 Code?

Need more information on how to fix the P0171 2007 Ford F150 code? Get Access to Factory Service Manuals

|Need Help with the P0171 2007 Ford F150 Code?

Get the P0171 2007 Ford F150 code diagnosed by a professional: Find a repair shop in your area

|Code P0171 2007 Ford F150 comments

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