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

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to prevent any electrical issues during repairs.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Remove the air intake duct and inspect for cracks or loose connections.
• Replace any damaged hoses or gaskets.
• Reattach the air intake duct securely.

3. Clean or Replace Mass Airflow Sensor

• Tools Required: MAF sensor cleaner, torx screwdriver
• Disconnect the electrical connector from the MAF sensor.
• Remove the sensor from the air intake tube.
• Clean the sensor carefully with MAF sensor cleaner; allow it to dry completely.
• If damaged, replace the MAF sensor with a new one.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail service port.
• Turn the ignition to the ON position (do not start the engine) and check the pressure reading.
• If the pressure is below specifications (typically around 40-50 psi), troubleshoot the fuel pump and filter.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors
• Remove the fuel rail with injectors attached.
• Inspect the injectors for clogs and proper operation.
• Clean the injectors using a cleaning kit or replace them if necessary.

6. Test for Vacuum Leaks

• Tools Required: Smoke machine or aerosol spray
• Use a smoke machine to introduce smoke into the intake system and observe for leaks.
• Alternatively, spray a flammable aerosol around vacuum connections while the engine is idling; if the idle changes, a leak is present.
• Repair any identified leaks.