how to fix P0455 code on Honda Accord 8th Generation (2008-2012)

Learn how to diagnose and fix P0455 large evaporative emission control system leak in Honda Accord 2008-2012. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is off.
• Disconnect the negative battery terminal to avoid any electrical shorts.

2. Inspect and Replace Gas Cap

• Remove the gas cap and inspect the rubber seal for damage.
• If damaged, replace with an OEM gas cap.
• Reinstall the cap properly ensuring it clicks securely.

3. EVAP Hose Replacement

• Identify and locate the faulty EVAP hoses based on the visual inspection.
• Use a socket set to remove any fasteners securing the hoses.
• Carefully detach the old hoses and install new hoses, ensuring a snug fit.
• Secure hoses with the appropriate clips.

4. EVAP Canister Inspection

• Locate the EVAP canister, typically found near the fuel tank.
• Remove any bolts or fasteners using an appropriate socket.
• Inspect for cracks or blockages, replacing the canister if necessary.
• Reinstall with new bolts if the canister was replaced.

5. Test and Replace Purge and Vent Valves

• Disconnect the electrical connectors from the purge valve and vent valve.
• Use a multimeter to test for continuity and proper function.
• Replace any valves that do not meet specifications.
• Reconnect electrical connectors securely.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal securely.
• Use the OBD-II scanner to clear the P0455 code.
• Start the engine and inspect for any new codes or check engine light illumination.