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

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, vacuum gauge, fuel pressure gauge, socket set, screwdriver set, MAF cleaner, new gaskets (if needed).
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the vacuum system.
  2. Inspect all vacuum hoses and connections for cracks or disconnections.
  3. Replace any damaged hoses and secure all connections.

3. Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the intake system.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Carefully remove the MAF sensor from its housing using a socket set.
  4. Spray MAF cleaner on the sensor element and allow it to dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "ON" position without starting the engine to check the fuel pressure.
  3. Compare the reading to the manufacturer's specifications (typically around 30-50 psi for most F-150s).
  4. If pressure is low, check the fuel pump and replace if necessary.

5. Inspect Intake Manifold and Fuel Injectors

• Sub-steps:
  1. Remove the intake manifold if necessary to inspect for leaks; replace gaskets as needed.
  2. Check the fuel injectors for clogs; clean or replace as necessary.