how to resolve P0171 lean condition code in Ford F-150 Fourteenth Generation (2021-present)?

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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical systems.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, socket set, flashlight.
• Perform a visual inspection of all vacuum hoses and connections.
• Use a vacuum gauge to check for leaks; if a leak is found, replace the damaged hose or gasket.
• Ensure the intake manifold bolts are torqued to the manufacturer's specifications (consult the service manual for exact torque values).

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, torque wrench.
• Remove the MAF sensor from the intake duct using a socket set.
• Spray the sensor with MAF cleaner and allow it to dry completely before reinstalling it.
• Reinstall the MAF sensor, ensuring it is secured to the manufacturer's torque specifications.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Connect the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine) to check the fuel pressure.
• If pressure is below specifications, inspect the fuel filter and replace it if clogged. Also, check the fuel pump operation.
• If the fuel system is functioning properly, continue to the next step.

5. Inspect and Clean Throttle Body

• Tools Required: Throttle body cleaner, socket set, screwdriver.
• Remove the air intake duct to access the throttle body.
• Use throttle body cleaner to clean the inside of the throttle body, ensuring all carbon buildup is removed.
• Reassemble the intake duct and reconnect any disconnected components.