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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.
• Allow the engine to cool before starting any work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold and engine.
  • Use a smoke machine or spray soapy water on suspected areas while the engine is running to identify leaks.
  • Replace any damaged hoses or gaskets as needed.
• Tools Required: Smoke machine or spray bottle.

3. Check and Clean the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor, typically situated between the air filter and throttle body.
  • Disconnect the electrical connector and remove the MAF sensor.
  • Clean the sensor using MAF cleaner spray (avoid touching the sensor element).
  • Reinstall the sensor and reconnect the electrical connector.
• Tools Required: MAF cleaner spray, screwdriver.

4. Inspect and Clean the Throttle Body

• Sub-steps:
  • Remove the air intake duct connected to the throttle body.
  • Use throttle body cleaner and a soft cloth to clean the intake side of the throttle body.
  • Reinstall the air intake duct securely.
• Tools Required: Throttle body cleaner, cloth, screwdriver.

5. Test Fuel Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the "ON" position (do not start) to check the pressure reading.
  • Compare the reading to the manufacturer's specifications; if low, check the fuel pump and filter.
• Tools Required: Fuel pressure gauge.

6. Inspect Fuel Injectors

• Sub-steps:
  • Use a multimeter to test the resistance of each injector; compare to specifications.
  • If the injectors are clogged, remove them and clean or replace as necessary.
• Tools Required: Multimeter, injector cleaning kit or replacement injectors.