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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect Air Intake System

• Tools Required: Screwdriver set, flashlight
• Steps:
  1. Remove the air intake duct and visually inspect for cracks or loose fittings.
  2. Use a smoke machine or soapy water to check for vacuum leaks.
  3. Tighten any loose clamps or replace damaged hoses.

3. Check Fuel System Pressure

• Tools Required: Fuel pressure gauge
• Steps:
  1. Connect the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the "ON" position (without starting the engine) and observe the pressure reading.
  3. Compare the reading with the manufacturer's specifications (typically around 40-50 psi for Honda).
  4. If pressure is low, inspect the fuel pump, filter, and lines for blockages.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Steps:
  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray the MAF sensor with MAF cleaner, avoiding touching the sensor elements.
  4. Allow it to dry completely before reinstalling.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit or replacement injectors
• Steps:
  1. Remove the fuel rail according to the service manual.
  2. Check each injector for clogs or leaks.
  3. Clean or replace faulty injectors as necessary.

6. Replace Engine Coolant Temperature Sensor (if faulty)

• Tools Required: Socket set
• Steps:
  1. Locate the coolant temperature sensor, usually near the thermostat housing.
  2. Disconnect the electrical connector and remove the sensor.
  3. Install a new sensor with the appropriate torque specifications.
  4. Reconnect the electrical connector.