how to fix the P0455 code on my Honda Accord 10th Generation (2018-2022)

Learn how to diagnose and fix P0455 fuel system leak in Honda Accord 10th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative terminal of the battery to avoid electrical shorts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Gas Cap

• Tools Required: None
• Remove the gas cap and inspect the rubber seal for any damage.
• If damaged, replace the gas cap with a new OEM or compatible cap.
• Reinstall the gas cap securely and ensure it clicks into place.

3. Inspect EVAP System Components

• Tools Required: Socket set, screwdrivers
• Start by inspecting the EVAP hoses and connections visually.
• If any hoses are damaged, cut out the defective section and replace it with new hose of the same diameter.
• Tighten all connections to ensure a secure fit.

4. Perform Smoke Test

• Tools Required: Smoke machine
• Connect the smoke machine to the EVAP service port.
• Activate the machine and look for smoke escaping from any part of the EVAP system.
• If leaks are found, repair or replace the affected components (hoses, valves, or the fuel tank).

5. Inspect and Replace EVAP Purge and Vent Valves

• Tools Required: Socket set, multimeter
• Locate the EVAP purge valve and vent valve. Disconnect electrical connectors and hoses.
• Use a multimeter to test the resistance of the valves; if they are out of specification, replace them.
• Reinstall new valves and reconnect all hoses and electrical connectors.