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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, duct tape or hose clamps
• Sub-steps:
  1. Use a vacuum gauge to test for leaks in the intake system.
  2. Visually inspect all vacuum hoses and clamps for cracks or looseness.
  3. Repair or replace any damaged hoses or connections.
  4. Recheck for leaks using the vacuum gauge.

3. Clean or Replace Mass Airflow Sensor (MAF)

• Tools Required: MAF cleaner, Torx screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the intake air duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the sensor using the Torx screwdriver.
  4. Spray MAF cleaner on the sensor components and let it dry.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and attach the fuel pressure gauge.
  2. Turn the ignition key to the "ON" position without starting the engine.
  3. Check the pressure reading against the manufacturer's specifications (typically around 40-50 psi).
  4. If pressure is low, check for fuel pump operation and replace the fuel filter if necessary.

5. Replace or Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit, socket set
• Sub-steps:
  1. Disconnect the fuel line and electrical connectors from the fuel injectors.
  2. Remove the fuel rail to access the injectors.
  3. Clean the injectors using a fuel injector cleaning kit or replace them if necessary.
  4. Reinstall the fuel rail and reconnect all components.

6. Reconnect Battery and Clear Codes

• After completing repairs, reconnect the battery.
• Use the OBD-II scanner to clear the P0174 code.