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

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hand-held vacuum pump
• Use a vacuum gauge to check for leaks in the intake system.
• Visually inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses or seals.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner
• Remove the MAF sensor from the intake duct.
• Spray the MAF cleaner onto the sensor elements to remove dirt and debris.
• Reinstall the MAF sensor or replace it if it is faulty.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (do not start) and check the pressure.
• If the pressure is below specifications, inspect the fuel pump, fuel filter, and fuel injectors for issues. Replace the fuel filter or pump if necessary.

5. Check and Replace Oxygen Sensors

• Tools Required: Oxygen sensor socket
• Inspect the upstream and downstream oxygen sensors for proper operation.
• Replace any faulty sensors, ensuring to use OEM parts for compatibility.

6. Clear Codes and Reassemble

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0174 code.
• Start the engine and allow it to reach operating temperature.