how to solve the P0456 code on my Toyota Highlander Fourth Generation (2020-present)?

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 battery to avoid any electrical issues.

2. Inspect and Replace Fuel Filler Cap

• Sub-steps:
  • Remove the fuel filler cap and inspect the rubber seal for wear or damage.
  • If damaged, replace the fuel filler cap with a new OEM part.
  • Reinstall the cap and ensure it clicks into place securely.

3. Repair or Replace EVAP Components

• Sub-steps:
  • If the smoke test revealed leaks, identify the source and replace damaged hoses or components.
  • For a faulty EVAP purge valve, disconnect the electrical connector and remove the valve using a socket set.
  • Install a new purge valve, ensuring all connections are secure.

4. Clear Codes and Test

• Sub-steps:
  • Reconnect the battery.
  • Use the OBD-II scanner to clear the P0456 code from the ECU.
  • Take the vehicle for a test drive to monitor for any reoccurrence of the code.