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

Learn how to diagnose and fix P0171 engine too lean condition in Ford F-150 13th generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, vacuum gauge, fuel pressure gauge, basic hand tools.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor using a screwdriver.
  4. Spray MAF sensor cleaner onto the sensor element and allow it to dry.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

3. Check for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a vacuum gauge to check for abnormal readings in the intake manifold.
  3. If leaks are found, replace the damaged hoses.

4. Test Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "On" position (do not start the engine) and check the fuel pressure against the manufacturer's specifications.
  3. If pressure is low, inspect the fuel pump and fuel filter for blockages or failures.
  4. Replace any faulty components.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the fuel injectors.
  2. Check wiring and connectors for signs of wear or damage.
  3. Use a multimeter to test the resistance of the injectors, ensuring they are within specifications.
  4. Clean or replace any clogged injectors.

6. Reconnect Battery and Clear Codes

• After completing the repairs, reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code and other related codes.