how to fix P0171 code on my 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 tools and parts needed for repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Vacuum Hoses

• Tools Required: Pliers, hose clamps.
• Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses with OEM replacement parts.
• Tighten hose clamps to secure connections.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver.
• Remove the MAF sensor from the intake duct.
• Spray the MAF sensor with MAF cleaner to remove dirt and oil deposits.
• Allow it to dry completely before reinstalling. If damaged, replace with a new MAF sensor.

4. Test and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "On" position (do not start the engine) and check the pressure reading against manufacturer specifications.
• If pressure is low, inspect the fuel pump, fuel filter, and fuel lines. Replace any faulty components.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit, socket set.
• Remove the fuel injectors from the fuel rail.
• Use an injector cleaning kit to clean the injectors or replace them if they are clogged or malfunctioning.
• Reinstall the cleaned or new injectors and reattach the fuel rail.

6. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0171 code from the ECM.
• Start the engine and monitor for any reoccurring codes.