how do I fix the P0174 code in my Honda Civic 10th Generation (2016-2021)?

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Inspect all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• Check the intake manifold gasket for leaks and replace if necessary.
• Reattach any loose connections securely.

3. Clean or Replace Mass Air Flow (MAF) Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft brush
• Locate the MAF sensor on the air intake duct.
• Disconnect the electrical connector and remove the sensor from the duct.
• Clean the sensor carefully with MAF cleaner. Do not touch the sensing elements.
• Reinstall the sensor, ensuring it is properly seated and the connector is secure.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge
• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "On" position (do not start) and check the fuel pressure. It should be within the specifications listed in the service manual.
• If pressure is low, inspect the fuel pump, filter, and regulator for issues and replace as necessary.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket
• Locate the downstream oxygen sensor for bank 2.
• Disconnect the sensor and use a socket to remove it.
• Inspect the sensor for any signs of damage or carbon buildup. Replace if necessary.
• Reinstall the new sensor, ensuring it is torqued to the manufacturer's specifications.