how to fix P0420 code on Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0420 catalytic converter efficiency issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, thermal imaging camera or thermometer.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the vehicle to cool before inspecting the exhaust system.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors connected to the exhaust system.
2. Use a socket wrench to carefully remove the sensors from their positions.
3. Inspect the wiring and connectors for damage. If any issues are found, repair or replace as necessary.
4. Install new oxygen sensors, tightening them to the manufacturer’s specifications using a torque wrench.
5. Reconnect the battery and clear the DTCs using the OBD-II scanner.

3. Inspect and Replace the Catalytic Converter

1. If the oxygen sensors are functioning properly, proceed to inspect the catalytic converter.
2. Use a socket set to remove the bolts securing the catalytic converter to the exhaust system.
3. Carefully detach the catalytic converter from the exhaust pipe and inspect it for damage or clogging.
4. If necessary, replace the catalytic converter with a new unit, ensuring it meets OEM specifications.
5. Reinstall the catalytic converter, tightening all bolts to the specified torque values.

4. Final Checks

1. Reconnect all sensors and components that were disturbed during the inspection.
2. Start the vehicle and allow it to reach operating temperature.
3. Use the OBD-II scanner to clear any codes and monitor for reoccurrence of the P0420 code.