how to fix P0174 code in my Ford F-150 Fourteenth Generation (2021-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, socket set, MAF cleaner, torque wrench.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Conduct a visual inspection of all vacuum hoses and connections.
  2. Use a vacuum gauge to identify any leaks by connecting it to the intake manifold.
  3. Replace any damaged or cracked hoses.
  4. Re-torque intake manifold bolts if necessary.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor with MAF cleaner spray, avoiding contact with the sensor element.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "ON" position (do not start) and check the fuel pressure reading.
  3. Compare the reading with manufacturer specifications (typically around 50-60 PSI for F-150).
  4. If the pressure is low, check the fuel pump, filter, and injectors for issues.
  5. Replace any faulty components as needed.

5. Clear Codes and Test

• Sub-steps:
  1. Use the OBD-II scanner to clear the P0174 code from the ECM.
  2. Start the engine and let it idle.
  3. Monitor for any return of the check engine light or reappearance of the P0174 code.