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

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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Remove the air intake duct and inspect for cracks or loose fittings.
• Replace any damaged hoses or gaskets.
• Reinstall the air intake duct securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or electronic cleaner
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake tube.
• Spray the sensor with MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect and Test Fuel System

• Tools Required: Fuel pressure gauge, socket set
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on (without starting the engine) to check fuel pressure.
• Compare the reading to manufacturer specifications; replace the fuel pump if pressure is low.
• Inspect fuel injectors for blockage or leakage; clean or replace as necessary.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Use a smoke machine to introduce smoke into the intake system and look for leaks.
• Alternatively, spray carburetor cleaner around the intake manifold and vacuum hoses; listen for changes in engine RPM.
• Seal any detected leaks using appropriate sealants or replace faulty components.