how to fix P0171 lean code on my Ford F-150 14th Generation (2021-2024)?

Learn how to diagnose and fix P0171 lean code in Ford F-150 14th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, flashlight, vacuum gauge
• Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections. Replace any damaged hoses.
• Use a flashlight to check the intake manifold for any visible cracks or leaks.
• If leaks are found, replace the intake manifold gasket.

3. Clean the Mass Air Flow Sensor

• Tools Required: MAF cleaner, soft cloth
• Remove the MAF sensor from the air intake duct.
• Spray the MAF sensor with a dedicated MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor ensuring it is securely fastened.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail. Start the engine and check the fuel pressure against the manufacturer’s specifications.
• If pressure is low, inspect the fuel pump and fuel filter. Replace the fuel filter if clogged, and consider replacing the fuel pump if it is not functioning correctly.

5. Replace Engine Coolant Temperature Sensor (if necessary)

• Tools Required: Socket set
• Locate the engine coolant temperature sensor on the engine.
• Disconnect the electrical connector and remove the sensor.
• Install the new sensor and reconnect the electrical connector.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code from the vehicle's memory.