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

Learn how to diagnose and fix P0171 engine too lean condition in Ford F-150 14th 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.
• Allow the engine to cool down to avoid burns.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or disconnections.
  2. Tighten any loose clamps or replace damaged hoses as needed.
  3. Check the intake manifold gasket for leaks; replace if necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Remove the sensor carefully, ensuring not to damage it.
  3. Clean the MAF sensor using MAF cleaner spray and allow it to dry completely.
  4. If damaged, replace the MAF sensor with a new one.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
  3. Compare the reading to the manufacturer's specifications; if low, check the fuel pump and filter.
  4. Replace the fuel filter and/or fuel pump if pressures are inadequate.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Remove the engine cover if applicable to access the fuel injectors.
  2. Inspect the injectors for any signs of clogging or leaks.
  3. Use an injector cleaning kit to clean the injectors, or replace them if necessary.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear the P0171 code and any other related codes.
  3. Start the engine and check for any reoccurrence of the code.