how to clear the P0420 code in my Toyota Corolla E210 (2019-2024) after repair?

Solution

1. Preparation

• Gather necessary tools and equipment.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Connect the OBD-II scanner to the vehicle’s diagnostic port, typically found under the dashboard near the steering column.

2. Access the OBD-II Scanner

• Turn the vehicle's ignition to the "ON" position without starting the engine.
• Power on the OBD-II scanner.

3. Clear the Code

• Navigate to the "Read Codes" section on the scanner and confirm that the P0420 code is displayed.
• Select the option to "Erase Codes" or "Clear Codes" on the scanner interface.
• Confirm the action when prompted.

4. Verify Code Clearance

• After clearing the code, turn off the ignition and disconnect the scanner.
• Start the engine and let it idle for a few minutes.
• Turn off the engine, restart it, and check to ensure the check engine light remains off.

5. Test Drive

• Take the vehicle for a short test drive, allowing the engine to reach operating temperature and ensuring that normal driving conditions are met.
• Reconnect the scanner to confirm that the P0420 code has not returned.