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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake

• Tools Required:
  • Socket set
  • Screwdriver set
• Check all intake hoses and connections for cracks or loose fittings.
• Replace any damaged hoses or gaskets found during inspection.
• Reattach all connections securely.

3. Clean or Replace MAF Sensor

• Tools Required:
  • MAF cleaner or electrical cleaner
• Carefully remove the MAF sensor from its housing using the appropriate socket or screwdriver.
• Spray MAF cleaner onto the sensor element and allow it to air dry completely.
• Reinstall the sensor ensuring it is securely fastened.

4. Check and Adjust Fuel Pressure

• Tools Required:
  • Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition key to the "ON" position (do not start the engine) and check the pressure reading.
• If the pressure is below specifications, check the fuel pump and filter; replace if necessary.

5. Inspect Vacuum Lines

• Tools Required:
  • Visual inspection tools, flashlight
• Check all vacuum lines for cracks or disconnections.
• Replace any damaged vacuum hoses.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery cable.
• Use the OBD-II scanner to clear the stored codes and reset the check engine light.