how to address the check engine light P0455 code in my Toyota Corolla E140?

Learn how to diagnose and fix P0455 large leak in the EVAP system for Toyota Corolla E140. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Fuel Cap

• Tools Required: None
• Remove the fuel cap and inspect for any signs of damage or wear.
• If damaged, replace the fuel cap with a new OEM or equivalent part.
• Reinstall the fuel cap and ensure it clicks into place.

3. Replace Damaged EVAP Hoses

• Tools Required: Socket set, pliers
• Locate the EVAP hoses connected to the canister and purge valve.
• Using pliers, disconnect the hoses from their fittings.
• Inspect the hoses for cracks or breaks. If damaged, cut to size and replace with new hoses.
• Reconnect the hoses securely to their fittings.

4. Inspect and Replace EVAP Canister

• Tools Required: Socket set, ratchet, torque wrench
• Locate the EVAP canister, typically found near the fuel tank.
• Disconnect any electrical connectors and hoses attached to the canister.
• Remove the mounting bolts using a socket set and ratchet.
• Replace the canister with a new one and torque the bolts to manufacturer specifications.
• Reconnect all hoses and electrical connectors.

5. Test Purge and Vent Valves

• Tools Required: Multimeter
• Locate the purge valve and vent valve.
• Disconnect the electrical connectors and use a multimeter to check for proper resistance as per specifications.
• If either valve is faulty, replace it with a new valve.

6. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0455 code.
• Start the engine and allow it to reach operating temperature.
• Take the vehicle for a test drive to ensure the check engine light does not return.