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

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Remove the air intake duct and visually inspect for cracks or loose fittings.
• Use a vacuum gauge to check for leaks; if found, replace or reseal components as necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx or socket set for removal
• Carefully remove the MAF sensor from the air intake.
• Spray the sensor with MAF cleaner and allow it to dry completely before reinstalling.
• If damaged, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, wrenches
• Connect the fuel pressure gauge to the fuel rail and turn the ignition to the ON position (do not start the engine).
• Verify that the fuel pressure is within the manufacturer’s specified range. If low, check the fuel pump and fuel filter.
• If fuel injectors are suspected of being clogged or leaking, remove and clean or replace them as needed.

5. Inspect PCV System

• Tools Required: Pliers, replacement PCV valve if necessary
• Locate and remove the PCV valve from its housing.
• Inspect for blockages; clean or replace the valve as needed.
• Check hoses leading to/from the PCV for cracks or leaks and replace if necessary.