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

Solution

1. Preparation

• Gather all tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Vacuum Lines

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Replace any damaged or cracked vacuum lines with new, OEM-spec hoses.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor on the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the MAF sensor using MAF sensor cleaner; do not touch the sensor element.
  • If the MAF sensor is faulty, replace it with a new one and reinstall.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Start the engine and check the fuel pressure reading against the manufacturer's specifications (typically around 50-60 psi).
  • If pressure is low, check the fuel pump and fuel filter for issues. Replace as necessary.

5. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the oxygen sensors on the exhaust system, typically before and after the catalytic converter.
  • Disconnect the electrical connectors and remove the sensors using an oxygen sensor socket.
  • Install new oxygen sensors, ensuring they are torqued to manufacturer specifications.

6. Replace Intake Manifold Gaskets

• Sub-steps:
  • Remove any components obstructing access to the intake manifold.
  • Disconnect the intake manifold from the engine block and remove it carefully.
  • Replace the old gaskets with new ones, ensuring a proper fit.
  • Reinstall the intake manifold and torque the bolts to the manufacturer’s specifications.