how to fix P0171 code in Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0171 engine too lean condition in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical issues.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge.
• Locate the air intake hoses and visually inspect for cracks or disconnections.
• Tighten any loose clamps and replace damaged hoses as necessary.
• Use a vacuum gauge to check for leaks in the intake system.

3. Clean or Replace MAF Sensor

• Tools Required: Torx screwdriver, MAF cleaner.
• Remove the MAF sensor by unscrewing it from the air intake.
• Spray the MAF cleaner on the sensor elements, avoiding contact with the wires.
• Allow it to dry completely before reinstalling.
• If the MAF sensor is found to be defective, replace it with a new one.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, wrench set.
• Attach the fuel pressure gauge to the fuel rail's test port.
• Turn the ignition on (do not start the engine) and check the fuel pressure against the manufacturer's specifications.
• If the pressure is low, inspect and replace the fuel filter or fuel pump as necessary.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaning kit (if necessary).
• Use a multimeter to check the resistance of each fuel injector.
• If any injector is outside the specified range, replace that injector.
• Clean the injectors using an injector cleaning kit if they are dirty.