how to fix the P0171 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 tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, screwdriver set
• Inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to test the intake manifold for leaks.
• Replace any damaged hoses or tighten loose connections.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Remove the MAF sensor from the air intake duct.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor ensuring it is securely connected.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, wrench set
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start) and check the fuel pressure.
• If pressure is below specifications, inspect the fuel pump and replace the fuel filter if necessary.

5. Inspect the PCV System

• Tools Required: Pliers, replacement PCV valve (if necessary)
• Locate the PCV valve and disconnect it from the intake manifold.
• Inspect the valve for blockage; if it is clogged or malfunctioning, replace it.

6. Clean the Throttle Body

• Tools Required: Throttle body cleaner, soft cloth
• Remove the air intake duct to access the throttle body.
• Use throttle body cleaner and a cloth to clean carbon deposits around the throttle plate.
• Reassemble the air intake duct and ensure all connections are secure.