how to fix P0174 code in Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, screwdrivers, MAF sensor cleaner, vacuum gauge.
• Safety Warnings: Disconnect the battery before starting any electrical work. Allow the engine to cool before inspecting components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or loose connections.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. Check the throttle body for carbon buildup and clean it if necessary.

3. Check and Repair Fuel System

• 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. Compare the fuel pressure reading to the manufacturer's specifications (typically between 50-60 psi).
  3. If pressure is low, inspect the fuel pump, fuel filter, and lines for blockages or leaks.
  4. Replace the fuel filter if it's clogged and consider replacing the fuel pump if it fails to deliver adequate pressure.

4. Inspect and Clean MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake tube.
  3. Spray the sensor element with MAF sensor cleaner and allow it to dry completely before re-installation.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

5. Test Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel injector electrical connectors.
  2. Use a multimeter to measure resistance across the injector terminals; it should be within manufacturer specifications (typically around 12-16 ohms).
  3. If any injectors are out of specification, replace them.