what does it mean if my Ford Explorer Fifth Generation (2011-2019) has code P0174

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before servicing.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses and connections for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to detect leaks by spraying around suspected areas while the engine is running.
  • Replace any damaged hoses or gaskets.
• Tools Required: Smoke machine or carburetor cleaner, hose clamps.

3. Check and Replace Fuel System Components

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail and check the pressure against the manufacturer's specifications.
  • If pressure is low, inspect the fuel pump, fuel filter, and fuel injectors for blockage or failure.
  • Replace any faulty components.
• Tools Required: Fuel pressure gauge, socket set.

4. Clean or Replace Mass Airflow Sensor

• Sub-steps:
  • Disconnect the MAF sensor electrical connector and remove it from the air intake.
  • Clean the sensor with MAF cleaner spray to remove dirt and debris.
  • If cleaning doesn’t resolve issues, replace the MAF sensor with a new one.
• Tools Required: MAF cleaner, screwdriver.

5. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate and disconnect the bank 2 oxygen sensor.
  • Use a socket wrench to remove the sensor.
  • Install a new oxygen sensor and reconnect it.
• Tools Required: Oxygen sensor socket, torque wrench.