how to fix P0455 EVAP leak code in Honda Accord 8th Generation (2008-2012)

Learn how to diagnose and fix P0455 EVAP leak code in Honda Accord (2008-2012). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent any electrical issues during the repair.

2. Inspect and Replace Gas Cap

• Tools Required: None
• Remove the gas cap and inspect for cracks or wear on the sealing surface.
• If damaged, replace the gas cap with an OEM or high-quality aftermarket cap.
• Reinstall the gas cap securely.

3. Inspect and Repair EVAP Hoses

• Tools Required: Pliers, socket set
• Locate the EVAP hoses connected to the charcoal canister and fuel tank.
• Inspect the hoses for cracks or disconnections.
• Replace any damaged hoses with new ones, ensuring they are secured tightly.

4. Smoke Test the EVAP System

• Tools Required: Smoke machine
• Connect the smoke machine to the EVAP service port.
• Activate the machine and look for smoke escaping from leaks.
• Repair any identified leaks by replacing the faulty components (hoses, purge valve, or canister).

5. Test and Replace Purge Valve (if necessary)

• Tools Required: Multimeter, socket set
• Disconnect the electrical connector from the EVAP purge valve.
• Use a multimeter to check for power and ground at the valve.
• If the valve does not operate correctly when voltage is applied, replace it.

6. Reassemble and Clear Codes

• Reconnect any disconnected components, ensuring all connections are secure.
• Reconnect the battery.
• Use an OBD-II scanner to clear the P0455 code from the system.