how to fix P0455 large EVAP leak in Toyota Corolla E170 (2013-2019)

Learn how to diagnose and fix P0455 large EVAP leak in Toyota Corolla E170. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, smoke machine, multimeter, socket set, pliers, torque wrench.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to prevent any electrical issues during repairs.

2. Inspect and Replace Gas Cap

• Remove the gas cap and visually inspect it for damage.
• If damaged, replace it with a new OEM gas cap.
• Ensure it clicks securely when reinstalled.

3. Inspect and Replace EVAP Hoses

• Locate the EVAP hoses connected to the fuel tank and purge valve.
• Check for cracks or disconnections; replace any damaged hoses.
• Use a socket set to remove and replace any clamps if necessary.

4. Test and Replace EVAP Purge Valve

• Disconnect the electrical connector from the EVAP purge valve.
• Use a multimeter to test for continuity; if there is no continuity, replace the valve.
• To replace, unscrew the valve from its mounting and install a new one, ensuring all connections are secure.

5. Repair Fuel Tank (if necessary)

• If any damage is found on the fuel tank, consider sealing it with an appropriate fuel tank repair kit or replacing the tank.
• Drain the fuel if necessary, and follow the kit instructions carefully.

6. Reset the OBD-II System

• Reconnect the battery.
• Use the OBD-II scanner to erase the P0455 code.
• Start the vehicle and allow it to idle for a few minutes.