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

Learn how to diagnose and fix P0171 lean code in Ford F-150 13th Generation. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Visually inspect all vacuum hoses and connections for cracks or disconnections.
• Use a vacuum gauge to check for proper vacuum levels.
• Replace any damaged hoses or reattach loose connections.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or electrical contact cleaner, screwdriver
• Locate the MAF sensor in the intake system.
• Remove the sensor carefully to avoid damage.
• Spray MAF cleaner on the sensor element and allow it to dry completely.
• Reinstall the MAF sensor ensuring it is secure.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail Schrader valve.
• Turn on the ignition (do not start the engine) and check the pressure reading against factory specifications.
• If pressure is below specifications, inspect the fuel pump and filter for issues and replace as necessary.

5. Clean Throttle Body

• Tools Required: Throttle body cleaner, cloth, screwdriver
• Remove the intake duct from the throttle body.
• Spray throttle body cleaner on a cloth and wipe the throttle plate and bore to remove carbon buildup.
• Ensure the throttle plate moves freely.

6. Replace ECT Sensor (if necessary)

• Tools Required: Socket set
• Locate the engine coolant temperature sensor.
• Disconnect the electrical connector and remove the sensor using a socket.
• Install a new ECT sensor and reconnect the electrical connector.