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

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

Solution

1. Preparation

• Tools Needed:
  • OBD-II scanner
  • Vacuum gauge
  • Fuel pressure gauge
  • Torque wrench
  • Cleaning supplies (MAF cleaner, rags)
• Safety Warnings:
  • Disconnect the battery before starting any electrical work.
  • Always wear safety goggles and gloves when working with fuel systems.

2. Inspect and Repair Vacuum Leaks

• Check all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses or gaskets.
• Use a vacuum gauge to confirm proper vacuum levels; if low, investigate further.

3. Clean or Replace the MAF Sensor

• Carefully remove the MAF sensor from the air intake.
• Use MAF sensor cleaner to spray and gently clean the sensor.
• Allow it to dry completely before reinstalling.
• Reinstall the MAF sensor and ensure it is properly connected.

4. Check and Repair Fuel System Components

• Fuel Filter: Replace the fuel filter if it’s clogged or hasn’t been changed as per the maintenance schedule.
• Fuel Injectors: Remove and clean the fuel injectors with a cleaning kit if they are dirty. If they are faulty, replace them.

5. Verify Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position without starting the engine and note the pressure reading.
• Compare the reading to the manufacturer specifications (typically around 55-65 psi for the F-150). If low, check fuel pump operation.

6. Inspect the Throttle Body

• Remove the throttle body from the intake manifold.
• Clean the throttle plate and intake ports using throttle body cleaner and a soft brush.
• Reinstall the throttle body and torque to the manufacturer's specifications.