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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while performing repairs.

2. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge, flashlight
• Sub-steps:
  1. Start the engine and listen for hissing sounds indicating a vacuum leak.
  2. Use a vacuum gauge connected to a manifold vacuum port to check for low vacuum readings.
  3. Visually inspect all vacuum lines and intake manifold gaskets for cracks or damage.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, torque wrench
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor using a socket set.
  3. Clean the sensor’s wire elements with MAF sensor cleaner and allow it to dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector, tightening to manufacturer specifications.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail pressure test port and attach the fuel pressure gauge.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading.
  3. If the pressure is below specifications, consider inspecting the fuel pump and filter for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit or ultrasonic cleaner
• Sub-steps:
  1. Remove the fuel rail from the engine, ensuring to relieve fuel pressure first.
  2. Disconnect the fuel injectors from the wiring harness and remove them from the fuel rail.
  3. Clean the injectors using a fuel injector cleaner kit or an ultrasonic cleaner.
  4. Reinstall the cleaned or replaced injectors into the fuel rail.

6. Check ECT Sensor

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the ECT sensor and disconnect its electrical connector.
  2. Using a multimeter, check the resistance of the sensor at various temperatures to ensure it is functioning correctly.
  3. Replace the sensor if it does not meet specifications.