how to fix P0455 EVAP leak code in Honda Accord Eleventh Generation (2023-present)

Learn how to diagnose and fix P0455 EVAP leak in Honda Accord (2023-present). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Gas Cap

• Sub-steps:
  • Remove the gas cap and inspect for cracks or damage.
  • If damaged, replace it with a new OEM gas cap.
  • Reinstall the gas cap securely until it clicks.

3. Repair/Replace EVAP Hoses

• Sub-steps:
  • Identify any damaged or cracked EVAP hoses during the visual inspection.
  • Use a hose cutter to remove damaged sections of the hose.
  • Measure and cut new replacement hoses to the appropriate length.
  • Attach the new hoses securely using clamps to prevent leaks.

4. Perform Smoke Test

• Sub-steps:
  • Connect a smoke machine to the EVAP service port.
  • Activate the smoke machine and look for smoke escaping from any leaks.
  • If leaks are found, repair or replace the damaged components as necessary.

5. Replace EVAP Canister (if needed)

• Sub-steps:
  • Locate the EVAP canister, typically found near the fuel tank.
  • Disconnect the electrical connector and any attached hoses.
  • Remove the mounting bolts using a socket set.
  • Install the new canister, reconnect hoses and electrical connections, and secure it with bolts.

6. Test EVAP Purge Valve

• Sub-steps:
  • Disconnect the purge valve from the electrical connector.
  • Apply power directly to the valve and check for operation (it should click and allow airflow).
  • Replace the valve if it does not operate correctly.