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

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the battery to prevent electrical issues while working.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers.
• Sub-steps:
  • Use a vacuum gauge to check intake manifold pressure.
  • Visually inspect all hoses and connections for cracks or disconnections.
  • Replace any damaged hoses or tighten loose connections.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF cleaner, screwdriver set.
• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Clean the sensor with MAF cleaner; do not touch the sensor elements.
  • Reinstall the MAF sensor and ensure it is securely fastened.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition to the “ON” position without starting the engine, and check the fuel pressure.
  • If the pressure is below specifications, check the fuel pump and replace if necessary.
  • Inspect and clean the fuel injectors using an injector cleaning kit if clogged.

5. Replace Intake Manifold Gasket (if necessary)

• Tools Required: Gasket scraper, torque wrench.
• Sub-steps:
  • Remove the intake manifold following the manufacturer’s instructions.
  • Clean the surfaces of the engine and manifold to remove old gasket material.
  • Install a new intake manifold gasket and torque to the manufacturer’s specifications.
  • Reassemble the intake manifold and reconnect all hoses.