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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the vehicle's battery to prevent electrical shorts.

2. Inspect Air Intake System

• Sub-steps:
  • Visually inspect the intake manifold and vacuum hoses for cracks or disconnected segments.
  • Use a smoke machine to detect vacuum leaks if necessary.
• Tools Required: Smoke machine (optional), flashlight.

3. Clean MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Spray MAF cleaner on the sensor elements and allow to dry.
  • Reinstall the MAF sensor securely.
• Tools Required: Torx screwdriver, MAF cleaner spray.
• Safety Warnings: Avoid touching the sensor elements directly as they are fragile.

4. Check Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Turn the ignition key to the ON position (do not start) and check the fuel pressure reading.
  • Compare the reading to the manufacturer’s specifications (usually around 30-50 psi).
  • If pressure is low, check the fuel pump and filter.
• Tools Required: Fuel pressure gauge.
• Safety Warnings: Relieve fuel pressure before disconnecting fuel lines to prevent spraying fuel.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the engine cover if necessary to access fuel injectors.
  • Check for any visible leaks around the injectors.
  • Use a noid light to test injector pulse while cranking the engine.
  • Replace any faulty injectors as required.
• Tools Required: Noid light, socket set.

6. Reassemble and Clear Codes

• Sub-steps:
  • Reinstall any components removed during the inspection.
  • Reconnect the battery.
  • Use the OBD-II scanner to clear the P0174 code.
• Tools Required: OBD-II scanner.