how to address P0171 lean code in my Ford F-150 13th Generation (2015-2020)

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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, socket set, flashlight
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to check for leaks; a low reading indicates a potential leak.
• Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Remove the MAF sensor from the air intake duct.
• Spray MAF sensor cleaner onto the sensing elements, avoiding contact with the wiring.
• Allow it to dry and reinstall the MAF sensor. If damaged, replace it with a new one.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge, fuel line disconnect tool
• Connect the fuel pressure gauge to the fuel rail and turn the ignition key to the "ON" position without starting the engine.
• Check the fuel pressure against the manufacturer’s specifications (typically around 55-65 psi).
• If low, check the fuel pump operation and replace it if necessary. Also, inspect the fuel filter and replace if clogged.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit, socket set
• Remove the fuel injectors from the intake manifold.
• Use a fuel injector cleaner kit to clean each injector thoroughly. If they are damaged or clogged beyond cleaning, replace them.

6. Final Checks

• Reconnect all components and ensure that all connections are secure.
• Reconnect the negative battery terminal.