how to fix P0174 code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum lines connected to the intake manifold.
  2. Replace any damaged or cracked hoses.
  3. Use a smoke machine to detect less obvious leaks if necessary.
• Tools Required: Smoke machine, pliers, replacement vacuum hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct (usually secured with screws or clamps).
  2. Clean the MAF sensor using MAF cleaner spray; do not touch the sensor element.
  3. If cleaning does not resolve the issue, replace the MAF sensor with a new one.
• Tools Required: Screwdriver, MAF cleaner spray, replacement MAF sensor (if needed).

4. Check Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. Compare the reading against manufacturer specifications (typically around 40-50 psi for Honda).
  4. If pressure is low, inspect the fuel pump, fuel filter, and fuel injectors.
• Tools Required: Fuel pressure gauge, wrench.

5. Throttle Body Cleaning

• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Clean the throttle body using throttle body cleaner and a soft cloth or brush.
  3. Ensure there is no carbon build-up obstructing the throttle plate.
• Tools Required: Throttle body cleaner, cloth, screwdriver.