how to fix the P0171 lean code on my Ford F-150 Fourteenth Generation (2021-present)

Learn how to diagnose and fix P0171 lean code in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Check all air intake hoses for cracks or loose connections.
• Tighten or replace any loose or damaged hoses.
• Inspect the air filter; replace if dirty or clogged.

3. Clean or Replace Mass Air Flow Sensor

• Tools Required: MAF cleaner (specific for MAF sensors)
• Remove the MAF sensor from the air intake duct.
• Clean the sensor wires with MAF cleaner and allow it to dry completely.
• If the sensor is faulty, replace it with a new one. Ensure it is properly calibrated according to the manufacturer’s specifications.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn on the ignition (do not start the engine) and check the pressure reading against the manufacturer's specifications.
• If the pressure is low, inspect the fuel pump and filter for issues and replace if necessary.

5. Inspect and Clean Throttle Body

• Tools Required: Throttle body cleaner, soft cloth
• Remove the throttle body from the intake manifold.
• Clean the throttle body using throttle body cleaner and a soft cloth to remove carbon deposits.
• Reinstall the throttle body and ensure that all gaskets are replaced if damaged.

6. Check Vacuum Lines

• Inspect all vacuum lines connected to the engine for cracks or disconnections.
• Replace any damaged lines and ensure all connections are secure.