how to fix check engine light due to P0174 in Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, flashlight, basic hand tools.
• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a vacuum gauge to test the intake manifold vacuum; low readings indicate leaks.
  3. Replace any damaged hoses or gaskets found during inspection.
  4. Reconnect any loose hoses securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver set.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor from the duct.
  3. Use MAF sensor cleaner to spray the sensing element and allow it to dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, multimeter, basic hand tools.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position without starting the engine.
  2. Check that the fuel pressure is within the manufacturer's specifications (typically around 30-50 psi for Ford).
  3. If pressure is low, inspect the fuel pump, filter, and injectors.
  4. Test the fuel injectors with a multimeter to ensure they are functioning properly.

5. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• Sub-steps:
  1. Use the OBD-II scanner to clear the P0174 code from the vehicle's computer.
  2. Start the engine and allow it to reach operating temperature.
  3. Take the vehicle for a test drive to monitor for any reoccurrence of the check engine light.