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

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

Solution

1. Preparation

• Gather tools and parts for the repair.
• Disconnect the negative battery terminal.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hand-held vacuum pump.
• Inspect all vacuum hoses and connections for cracks or loose fittings.
• Use a vacuum gauge to test the intake manifold; if the reading is low, locate and repair leaks.
• Replace any damaged hoses and recheck the system for leaks.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF sensor cleaner, small screwdriver.
• Remove the MAF sensor from the air intake duct.
• Clean the MAF sensor with MAF cleaner; do not touch the sensor element directly.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "on" position without starting the engine and check the pressure. It should meet manufacturer specifications (usually around 50-60 psi).
• If the pressure is low, inspect the fuel pump and filter for clogs and replace them if necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, injector removal tool.
• If fuel injectors are suspected of being clogged, remove them using the injector removal tool.
• Soak the injectors in a fuel injector cleaner solution or use a professional cleaning service.
• Reinstall the injectors and ensure all connections are secure.

6. Reassemble and Test

• Reconnect all components removed during the repair.
• Reattach the negative battery terminal.
• Clear the P0171 code using the OBD-II scanner and start the engine.