how to fix P0174 code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Tools required: OBD-II scanner, socket set, multimeter, vacuum gauge, cleaning supplies, torque wrench.

2. Inspect and Replace Vacuum Hoses

• Sub-steps:
  • Visually inspect all vacuum hoses for damage or wear.
  • Replace any defective hoses with OEM parts, ensuring a proper fit and seal.
  • Torque specifications (if applicable) for hose clamps should be followed as per manufacturer guidelines.

3. Clean or Replace Mass Air Flow (MAF) Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake path.
  • Disconnect the electrical connector and remove the sensor from its housing.
  • Use MAF cleaner to spray the sensor element, avoiding contact with other components.
  • Allow the sensor to dry completely before reinstalling or replace it if damaged.

4. Check Fuel Delivery

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine to check fuel pressure; it should meet manufacturer specifications (typically around 40-50 psi for Honda).
  • If pressure is low, inspect the fuel pump, filter, and injectors for proper operation; replace any faulty components.

5. Inspect and Replace Intake Manifold Gasket

• Sub-steps:
  • Remove the intake manifold carefully, marking all connections and bolts for reassembly.
  • Inspect the gasket for damage and replace it with a new OEM gasket.
  • Reinstall the intake manifold and torque bolts to specification, usually around 16-22 lb-ft.