how to fix P0174 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather necessary tools and parts before starting.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge
• Instructions:
  1. Visually inspect all vacuum hoses and connections for cracks, breaks, or looseness.
  2. Use a vacuum gauge to check for normal readings; replace any damaged hoses.
  3. If leaks are found, replace the affected vacuum lines.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner spray, screwdriver
• Instructions:
  1. Locate the MAF sensor in the air intake duct.
  2. Remove the sensor carefully using a screwdriver.
  3. Spray the sensor with MAF cleaner and let it dry completely.
  4. Reinstall the MAF sensor securely.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Instructions:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and check the pressure reading against specifications (typically 40-50 psi).
  3. If pressure is low, inspect the fuel pump and fuel filter; replace as necessary.

5. Inspect Throttle Body

• Tools Required: Throttle body cleaner, soft cloth
• Instructions:
  1. Remove the intake duct to access the throttle body.
  2. Clean the throttle body using throttle body cleaner and a soft cloth, ensuring no debris enters the intake manifold.
  3. Reattach the intake duct securely.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0174 code and any other related codes.