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

Learn how to diagnose and fix P0171 engine lean condition in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, pliers, flashlight.
• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or wear.
  2. Tighten any loose clamps securing the hoses.
  3. Replace any damaged hoses or connections.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct.
  3. Clean the sensor using MAF sensor cleaner; do not touch the sensing element.
  4. If the sensor is faulty, replace it with a new one.

4. Inspect Fuel Delivery System

• Tools Required: Fuel pressure gauge, wrench set.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start the engine) to check for fuel pressure.
  3. If the pressure is below specifications, check the fuel pump and replace if necessary.
  4. Replace the fuel filter if it has not been changed in accordance with the maintenance schedule.

5. Check and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps.
• Sub-steps:
  1. Use a vacuum gauge to check the engine for vacuum leaks.
  2. Inspect all vacuum lines for wear; replace any that are cracked or damaged.
  3. Ensure that all connections are secure.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code and any other related codes.