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

Solution

1. Preparation

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

2. Inspect and Clean MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver, safety glasses.
• Use the Torx screwdriver to remove the MAF sensor from the air intake duct.
• Spray MAF cleaner onto the sensor elements and allow it to dry completely before reinstalling.
• Reinstall the MAF sensor and reconnect the electrical connector.

3. Check and Repair Vacuum Leaks

• Tools Required: Smoke machine or propane torch (unlit), safety gloves.
• Use a smoke machine to introduce smoke into the intake system or carefully use unlit propane around hoses and gaskets.
• Observe for any smoke escaping, indicating a leak.
• Replace or repair any damaged hoses, gaskets, or seals found during the inspection.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail test port and remove the cap.
• Connect the fuel pressure gauge to the port.
• Turn the key to the "ON" position (without starting) to check the fuel pressure. It should match the manufacturer's specifications (around 40-50 psi for most models).
• If the pressure is low, check the fuel pump and filter for issues.

5. Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, ratchet, and extension.
• Locate the bank 2 oxygen sensor (usually near the catalytic converter).
• Disconnect the electrical connector and remove the sensor using the O2 sensor socket.
• Install the new sensor, ensuring it is tightened to the manufacturer's torque specifications.
• Reconnect the electrical connector.

6. Clear Diagnostic Codes

• Tools Required: OBD-II scanner.
• After making repairs, use the OBD-II scanner to clear the fault codes.
• Start the engine and allow it to reach operating temperature.