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

Learn how to diagnose and fix P0171 lean fuel condition in Ford F-150 12th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secured with wheel chocks.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually examine the air intake duct, hoses, and clamps for damage or loose fittings.
  2. Tighten any loose clamps.
  3. Replace any damaged hoses or components found during the inspection.
  4. Use a smoke machine to check for vacuum leaks if needed.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor within the air intake system.
  2. Remove the MAF sensor using a Torx bit.
  3. Clean the sensor with MAF cleaner spray, and let it dry completely.
  4. Reinstall the MAF sensor and ensure it is securely fastened.

4. Test and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition key to the "on" position (without starting the engine) and check the fuel pressure reading.
  3. If the pressure is below specifications, check the fuel pump and fuel filter; replace if necessary.
  4. If pressure is adequate, check each fuel injector for proper operation using a noid light or multimeter.

5. Clear Codes and Reassess

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear any trouble codes.
  3. Take the vehicle for a test drive to ensure the P0171 code does not return.