how to fix the P0171 lean code on Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0171 lean code in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to prevent electrical shorts during repairs.
• Allow the engine to cool before working.

2. Inspect and Repair Air Intake

• Sub-steps:
  • Visually inspect the air intake hoses and the intake manifold for any visible cracks or damage.
  • If any damage is found, replace the faulty components.
  • Tighten all connections to ensure there are no leaks.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor. It is usually positioned between the air filter and the throttle body.
  • Disconnect the electrical connector and remove the MAF sensor from the intake housing.
  • Clean the sensor using MAF cleaner. Do not touch the sensor elements.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition key to the "ON" position without starting the engine and check the pressure reading.
  • It should be within the manufacturer’s specified range. If not, check the fuel pump and fuel filter for issues.
  • If fuel pressure is low, replace the fuel filter or fuel pump as needed.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the injectors. Ensure you have a container to catch any spilled fuel.
  • Inspect each injector for clogs or leaks. Use an injector cleaning kit if necessary.
  • Reinstall the injectors and the fuel rail, ensuring all connections are secure.