how to fix P0171 lean code in Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0171 lean code in Ford F-150 14th Generation. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all air intake hoses for cracks or loose connections.
  • Replace any damaged hoses or clamps.
  • Ensure the air filter is clean; replace it if necessary.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor with MAF sensor cleaner and let it dry, or replace it if damaged.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine to check the fuel pump operation.
  • Compare the pressure reading to the manufacturer's specifications (usually between 50-60 psi); replace the fuel pump or filter if pressure is low.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • Disconnect the fuel lines from the injectors.
  • Remove the injectors from the intake manifold.
  • Clean the injectors using an ultrasonic cleaner or replace if clogged or malfunctioning.

6. Check for Vacuum Leaks

• Sub-steps:
  • Inspect all vacuum lines for cracks or disconnections.
  • Spray carburetor cleaner around suspected leak areas while the engine is idling; listen for changes in engine RPM.
  • Replace any damaged vacuum hoses and reseal intake gaskets as needed.