how to fix P0171 code on Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0171 engine lean condition in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Hose clamp pliers, vacuum gauge, flashlight
• Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to check for leaks; a reading lower than expected indicates a problem.
• Repair or replace any damaged hoses or gaskets.

3. Fuel Pressure Test

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Attach the fuel pressure gauge and turn the ignition to the "On" position without starting the engine to check the fuel pressure.
• Compare the reading to the manufacturer's specification (usually around 30-65 PSI).
• If the pressure is low, inspect the fuel pump and fuel filter. Replace any faulty components.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Disconnect the MAF sensor connector and remove the sensor from the air intake.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely.
• Reinstall the sensor and reconnect the electrical connector.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, fuel injector cleaning kit (if needed)
• Remove the fuel injectors from the fuel rail.
• Clean the injectors using a fuel injector cleaning kit or replace them if they are clogged or defective.

6. Replace Oxygen Sensor (if necessary)

• Tools Required: Oxygen sensor socket, torque wrench
• Locate the pre-catalytic converter oxygen sensor and use the oxygen sensor socket to remove it.
• Install the new oxygen sensor and torque to manufacturer specifications (usually around 30-40 ft-lbs).
• Reconnect any electrical connectors.