how can I fix the P0171 code on my Ford F-150 13th Generation (2015-2020)?

Learn how to diagnose and fix P0171 engine too 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.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, pliers
• Inspect the air intake duct, ensuring all connections are secure and hoses are intact.
• Replace any damaged hoses or components.
• Reconnect all air intake connections.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, soft cloth
• Remove the MAF sensor from the air intake.
• Spray MAF cleaner on the sensor elements; do not touch them.
• Allow it to dry, then reinstall the sensor securely.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge to the Schrader valve.
• Turn the ignition to the "ON" position without starting the engine and check the pressure.
• If pressure is below specifications, check the fuel pump and replace if necessary.

5. Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit, appropriate fuel injector cleaner
• Remove the fuel injectors from the fuel rail.
• Use the cleaning kit to clean the injectors according to the manufacturer’s instructions.
• Reinstall the cleaned injectors and ensure they are properly seated.

6. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Use a smoke machine to detect leaks in vacuum lines, or spray carburetor cleaner around suspected areas while the engine is running to check for RPM changes.
• Repair or replace any leaking hoses or gaskets.