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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, pliers, vacuum gauge
• Inspect the air intake ducting for leaks or cracks:
  • Remove the air intake duct.
  • Visually check for cracks or loose fittings.
  • Use a vacuum gauge to check for leaks in the system.
• Replace any damaged components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Locate the MAF sensor in the air intake system:
  • Disconnect the electrical connector.
  • Remove the sensor using a socket.
  • Clean the sensor with MAF cleaner and let it dry.
  • Reinstall the sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail:
  • Turn the ignition to the "ON" position without starting the engine.
  • Check the fuel pressure reading against manufacturer specifications (usually around 40-60 psi).
• If the pressure is low, check the fuel pump and filter for issues and replace as necessary.

5. Inspect Vacuum Lines

• Visually inspect all vacuum hoses connected to the engine:
  • Look for any cracks, disconnections, or signs of wear.
  • Replace any damaged vacuum lines with new ones.

6. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket
• Locate the downstream oxygen sensor on bank 2:
  • Disconnect the electrical connector.
  • Remove the sensor using the O2 sensor socket.
  • Install the new O2 sensor and reconnect the electrical connector.