how to fix 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 necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Air Intake System

• Tools Required: Vacuum gauge, hose clamps, socket set.
• Check all air intake hoses and connections for cracks or loose fittings.
• Use a vacuum gauge to check for leaks. If found, replace the damaged hoses or clamps.
• Inspect the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver set.
• Locate the MAF sensor in the air intake path.
• Disconnect the electrical connector and remove the MAF sensor.
• Clean the sensor with MAF cleaner, ensuring not to touch the sensor elements.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the ON position without starting the engine and observe the pressure readings.
• If the pressure is below specifications, inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaner.
• Test each fuel injector for proper resistance with a multimeter.
• If any injector is out of specification, replace it.
• Clean the injectors with a professional-grade injector cleaner if they are functioning but dirty.

6. Inspect Exhaust System

• Tools Required: Socket set, flashlight.
• Visually inspect the exhaust system for any leaks or blockages.
• Repair any leaks in the exhaust system using appropriate sealant or replacement parts.