how to fix P0455 code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent any electrical issues.

2. Inspect and Replace Gas Cap

• Sub-steps:
  • Remove the gas cap and inspect the rubber gasket for cracks or wear.
  • If damaged, replace the gas cap with a new one that meets OEM specifications.
  • Reinstall the gas cap securely and ensure it clicks into place.

3. Inspect EVAP Hoses

• Sub-steps:
  • Check all hoses connected to the EVAP system for cracks, loose connections, or deterioration.
  • Replace any damaged hoses with new ones from an authorized dealer or parts supplier.
  • Ensure all connections are tight and secure.

4. Replace or Repair Purge Valve

• Sub-steps:
  • Locate the purge valve, usually found near the intake manifold or EVAP canister.
  • Disconnect the electrical connector and vacuum lines from the purge valve.
  • Remove the purge valve using a socket set.
  • Test the valve with a multimeter; if it fails, replace it with a new one.
  • Reinstall the new or repaired purge valve and reconnect all lines securely.

5. Smoke Test (If Necessary)

• Sub-steps:
  • Attach a smoke machine to the EVAP system through the service port.
  • Activate the smoke machine and observe for any smoke escaping, indicating a leak.
  • Repair any identified leaks by replacing affected components (hoses, canister, etc.).

6. Reset the ECU

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Start the engine and allow it to run for a few minutes.
  • Use the OBD-II scanner to clear the P0455 code from the ECU.