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

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, MAF sensor cleaner, socket set, vacuum gauge.
• Clear any existing trouble codes from the ECM using the OBD-II scanner.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses and connections for cracks or disconnections.
  2. If any leaks are found, replace the damaged hoses or reattach loose connections.
  3. Check the air filter and replace it if it is dirty or clogged.

3. Test and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the sensor using the appropriate socket.
  4. Clean the MAF sensor with MAF sensor cleaner, ensuring no residue remains.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Attach the fuel pressure gauge to the test port.
  3. Turn the ignition key to the "ON" position without starting the engine and record the pressure reading.
  4. If the pressure is below specifications (refer to the service manual for exact values), inspect the fuel pump and fuel filter for issues.

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Locate the oxygen sensors, particularly the one on bank 2.
  2. Inspect the wiring and connector for damage.
  3. Use a multimeter to test the sensor's output; replace if it is malfunctioning.

6. Vacuum Leak Inspection

• Sub-steps:
  1. Use a vacuum gauge to test for leaks in the intake manifold and vacuum lines.
  2. If a leak is found, replace the affected gasket or hose.