what does it mean if my Ford F-150 12th Generation (2009-2014) is throwing a P0171 code

Learn how to diagnose and fix P0171 lean condition in Ford F-150 12th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before working on the intake system.

2. Inspect Air Intake System

• Tools Required: Socket set, flashlight
• Check all intake hoses and connections for leaks or cracks; replace any damaged components.
• Tighten any loose clamps.

3. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail in the engine bay and attach the fuel pressure gauge.
• Turn the ignition to the "ON" position without starting the engine and check the pressure; it should match the specifications for your vehicle (typically 30-45 psi).
• If pressure is low, inspect the fuel pump and filter for issues.

4. Clean/Inspect MAF Sensor

• Tools Required: MAF sensor cleaner (specific cleaner), screwdriver
• Disconnect the MAF sensor connector.
• Remove the sensor from the intake system carefully.
• Clean the sensor using MAF sensor cleaner; do not touch the sensor elements directly.
• Reinstall the MAF sensor and reconnect its connector.

5. Inspect Vacuum Lines

• Tools Required: Visual inspection
• Check all visible vacuum lines for cracks or disconnections.
• Replace any damaged lines with new vacuum hose.

6. Check ECT Sensor

• Tools Required: Multimeter
• Disconnect the ECT sensor connector.
• Use a multimeter to check the resistance of the sensor; compare the readings to the manufacturer's specifications.
• Replace the ECT sensor if it is out of the specified range.