how to fix the P0171 code on my Ford F-150 12th Generation (2009-2014)

Learn how to diagnose and fix P0171 fuel system issue in Ford F-150 (2009-2014). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the battery to ensure safety while working on electrical systems.

2. Inspect and Replace Vacuum Hoses

• Tools Required: Pliers, vacuum hose replacement.
• Instructions:
  • Visually inspect all vacuum hoses for cracks, tears, or disconnections.
  • Replace any damaged hoses with new ones of the same size and specification.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Instructions:
  • Locate the MAF sensor in the intake duct.
  • Disconnect the electrical connector and remove the sensor using a screwdriver.
  • Clean the sensor with MAF cleaner, following the instructions on the cleaner.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Test and Replace Fuel Pump (if necessary)

• Tools Required: Fuel pressure gauge, socket set.
• Instructions:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Start the engine and observe the pressure reading; it should match specifications (usually around 30-40 psi for most F-150s).
  • If the pressure is below specifications, replace the fuel pump.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, socket set.
• Instructions:
  • Remove the fuel rail to access the injectors.
  • Inspect each injector for clogs or leaks.
  • Clean the injectors using a fuel injector cleaning kit or replace them if they are faulty.