how to fix P0420 code on Tesla Model Y Current (2020-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and is secure.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Locate the Oxygen Sensors: Identify the upstream and downstream oxygen sensors related to the catalytic converter.
2. Remove the Sensors: Utilize an oxygen sensor socket to remove both sensors, taking care not to damage the wiring.
3. Test the Sensors: Use a multimeter to check resistance and voltage output for functionality. Replace any faulty sensors.
4. Install New Sensors: Apply anti-seize compound to the threads of the new sensors and install them securely.

3. Inspect and Replace the Catalytic Converter

1. Remove Exhaust Components: If necessary, detach any exhaust pipes or components that may obstruct access to the catalytic converter.
2. Remove the Catalytic Converter: Unbolt the catalytic converter from the exhaust system using a socket set. Inspect the mounting hardware for wear and replace if needed.
3. Install New Catalytic Converter: Position the new catalytic converter and secure it using the appropriate torque specifications (usually found in the service manual).
4. Reassemble Exhaust Components: Reattach any removed exhaust parts, ensuring a tight seal.

4. Final Checks

1. Reconnect Battery: Reconnect the negative terminal of the battery.
2. Clear Codes: Use the OBD-II scanner to clear the P0420 code and any other stored codes.
3. Test Drive: Drive the vehicle for a short distance to monitor for any reoccurrence of the check engine light.