how can I fix the P0420 code on my Tesla Model 3 Original (2017-2023)

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 by removing the negative terminal.

2. Inspect and Clean Oxygen Sensors

• Tools Required: O2 sensor socket, cleaning solution.
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
• Clean the sensor connectors and the sensor tips with a suitable cleaning solution.
• Reinstall the oxygen sensors and torque to manufacturer specifications (typically around 30-40 ft-lbs).

3. Check and Replace the Catalytic Converter (if necessary)

• Tools Required: Socket set, jack stands, torque wrench.
• If the catalytic converter is damaged, support the vehicle securely on jack stands.
• Remove the exhaust system components connected to the catalytic converter.
• Disconnect any sensors or wiring attached to the converter.
• Remove the catalytic converter from the exhaust system.
• Install the new catalytic converter and reconnect all components, ensuring all bolts are torqued to manufacturer specifications.

4. Clear Error Codes

• Reconnect the battery by attaching the negative terminal.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.

5. Test Drive

• Drive the vehicle for a short distance to allow the ECU to monitor the system.
• Keep an eye on the check engine light and monitor performance.