how to fix P0174 code in Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect and Repair Vacuum Leaks

• Inspect Vacuum Hoses: Visually check all vacuum hoses for cracks, breaks, or loose connections. Replace any damaged hoses.
• Smoke Test: If necessary, perform a smoke test to identify hidden vacuum leaks.

3. Clean or Replace MAF Sensor

• Remove MAF Sensor: Disconnect the electrical connector and unbolt the MAF sensor from the air intake duct.
• Clean Sensor: Use MAF sensor cleaner to clean the sensor elements thoroughly. Allow it to dry completely.
• Reinstall Sensor: Reattach the MAF sensor, ensuring it is secured and the connector is properly connected.

4. Check and Repair Fuel Pressure

• Attach Fuel Pressure Gauge: Connect the fuel pressure gauge to the fuel rail test port.
• Start Engine: Start the engine and observe the fuel pressure reading. Compare it to manufacturer specifications (typically between 30-45 psi).
• Replace Fuel Pump: If the pressure is low, replace the fuel pump or fuel filter as necessary.

5. Inspect Intake Manifold and Gaskets

• Remove Intake Manifold: Disconnect necessary components (throttle body, sensors, etc.) and remove the intake manifold.
• Inspect Gaskets: Check the intake manifold gaskets for wear or damage. Replace if necessary.
• Reinstall Manifold: Reinstall the intake manifold, ensuring proper torque specifications for bolts.

6. Verify PCV System

• Inspect PCV Valve: Remove the PCV valve and check for blockage. Replace if needed.
• Check Hoses: Inspect hoses connected to the PCV system for any cracks or leaks.