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

Learn how to diagnose and fix P0171 engine too 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.
• Allow the engine to cool down.

2. Inspect Air Intake System

• Tools Required: Screwdriver set, flashlight
• Inspect the air intake hose and connections for cracks or looseness.
• If any defects are found, replace or secure the components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdrivers
• Remove the MAF sensor from the air intake assembly.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor ensuring it is securely fastened.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
• Check the fuel pressure against the manufacturer specifications (typically around 30-50 psi).
• If the pressure is low, inspect the fuel pump and fuel filter.

5. Inspect Fuel Injectors

• Tools Required: Injector tester (if applicable)
• Visually inspect fuel injectors for leaks or clogs.
• If necessary, perform a fuel injector cleaning or replace faulty injectors.

6. Check ECT Sensor

• Tools Required: Multimeter
• Disconnect the ECT sensor and check resistance with a multimeter.
• Compare the readings to the specifications in the repair manual. Replace if readings are off.