how to fix P0455 code on Honda Civic 11th Generation (2022-Present)

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 negative terminal to prevent electrical shorts.

2. Inspect and Replace Fuel Filler Cap

• Tools Required: None specific
• Sub-steps:
  1. Unscrew the fuel filler cap.
  2. Inspect the cap for cracks, worn seals, or debris.
  3. If damaged, replace with a new OEM fuel filler cap.
  4. Reinstall the cap and ensure it is secure.

3. Inspect and Repair EVAP System

• Tools Required: OBD-II scanner, smoke machine, basic hand tools
• Sub-steps:
  1. Perform a smoke test on the EVAP system to locate any leaks.
  2. If leaks are found, replace the damaged hoses or components (e.g., EVAP canister, purge valve).
  3. Check that all connections are secure and not cracked.
  4. Reconnect any disconnected components.

4. Clear Codes and Test

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the battery terminal.
  2. Use the OBD-II scanner to clear the P0455 code.
  3. Start the engine and let it idle for a few minutes.
  4. Take the vehicle for a test drive to ensure the check engine light does not return.