how to fix P0174 code in Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle battery to prevent electrical shock.
• Ensure the engine is cool before proceeding.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold and check for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to identify vacuum leaks. Apply the cleaner around suspected areas, and listen for changes in engine RPM.
  • Replace any damaged hoses or tighten loose connections.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor, usually found between the air filter and the throttle body.
  • Disconnect the electrical connector and remove the sensor from its housing.
  • Use MAF sensor cleaner to gently clean the sensor. Avoid touching the sensor element.
  • Reinstall the sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the Schrader valve on the fuel rail.
  • Turn the ignition to the "ON" position (do not start) to check the pressure reading.
  • Refer to the manufacturer specifications for acceptable pressure levels (typically around 30-40 psi for most vehicles).
  • If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or failures.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the injectors.
  • Inspect each injector for signs of clogging or leaks.
  • If necessary, clean the injectors using a professional injector cleaning kit or replace them if they are faulty.