how to fix P0174 code in Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to ensure safety before working on electrical systems.
• Allow the engine to cool down if it has been running.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to test for leaks around intake components.
  • Replace any damaged vacuum hoses or gaskets as necessary.
• Tools Required: Smoke machine, carburetor cleaner, pliers, replacement hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor; it is typically found between the air filter and the throttle body.
  • Carefully disconnect the sensor's electrical connector.
  • Remove the MAF sensor from the air intake.
  • Clean the MAF sensor with MAF cleaner, avoiding contact with the sensor element.
  • Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: MAF cleaner, screwdriver, torx bits.

4. Test Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail's test port.
  • Turn the ignition key to the "On" position without starting the engine to check the fuel pressure.
  • Compare the reading to manufacturer specifications (typically around 55-65 psi for Ford engines).
  • If pressure is low, inspect the fuel pump and filter for issues and replace as necessary.
• Tools Required: Fuel pressure gauge, socket set, fuel line removal tool.

5. Inspect and Test Oxygen Sensors

• Sub-steps:
  • Locate the oxygen sensors (pre-cat and post-cat) on Bank 2.
  • Disconnect the electrical connectors for the sensors.
  • Use a multimeter to check the sensors’ resistance and compare with manufacturer specifications.
  • Replace any faulty oxygen sensors.
• Tools Required: Multimeter, socket set.