how to fix the P0174 code on my Ford F-150 14th Generation (2021-2024)

Solution

1. Preparation

• Gather all the required tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting any work on the vehicle.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum leak tester.
• Sub-steps:
  1. Remove the air intake duct to access the throttle body and MAF sensor.
  2. Inspect for any cracks or loose connections in the intake hoses.
  3. Use a vacuum leak tester to check for leaks; repair or replace any damaged hoses.
  4. Reconnect the air intake duct securely.

3. Fuel System Check

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the key to the "On" position (do not start the engine) to check the pressure.
  3. Verify that the pressure is within manufacturer specifications (typically around 30-65 PSI for most F-150s).
  4. If the pressure is low, inspect the fuel pump, filter, and injectors for issues.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner (or isopropyl alcohol), Torx screwdriver.
• Sub-steps:
  1. Remove the MAF sensor from the air intake assembly.
  2. Spray the MAF sensor with cleaner and allow it to dry completely.
  3. Reinstall the MAF sensor securely.

5. Inspect and Repair Exhaust System

• Tools Required: Socket set, exhaust gasket kit (if necessary).
• Sub-steps:
  1. Visually inspect the exhaust system for any signs of leaks, especially at the manifold and joints.
  2. Use a smoke machine if available to identify any undetected leaks.
  3. Repair or replace any damaged components or gaskets.

6. Test and Replace Oxygen Sensors (if necessary)

• Tools Required: Multimeter, O2 sensor socket.
• Sub-steps:
  1. Use a multimeter to test the voltage output of the oxygen sensors.
  2. If readings are out of specifications (typically between 0.1V and 0.9V for narrowband sensors), replace the faulty sensor.
  3. Reinstall new sensors and ensure they are properly tightened.