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

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

Solution

1. Preparation

• Gather tools and ensure the vehicle is parked on a level surface.
• Disconnect the battery to prevent any electrical shorts during repairs.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to identify any vacuum leaks.
  • Replace any damaged hoses and ensure all connections are secure.

3. Clean the Mass Air Flow (MAF) Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Remove the sensor using a screwdriver.
  • Clean the MAF sensor with MAF cleaner and allow it to dry completely.
  • Reinstall the sensor and ensure it's securely fastened.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the "On" position without starting the engine to check the fuel pressure reading.
  • Compare the reading to the manufacturer's specifications (typically 30-50 psi for F-150).
  • If pressure is low, inspect the fuel pump and fuel filter for issues and replace as necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the intake manifold.
  • Inspect for clogs or damage; clean or replace if necessary.
  • Reinstall injectors ensuring proper sealing and connection.

6. Reassemble and Test

• Reconnect the battery.
• Clear the P0171 code using an OBD-II scanner.
• Start the engine and observe for any abnormal sounds or symptoms.