how to fix P0420 code on Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Using a socket wrench, carefully remove the oxygen sensors.
3. Inspect the sensor tips for contamination or damage.
4. If damaged, install new oxygen sensors:
   • Apply anti-seize compound on the threads of the new sensor.
   • Torque the sensors to the manufacturer's specifications (typically around 30 lb-ft).
5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. If the catalytic converter is determined to be faulty, remove the exhaust system components to access it:
   • Unscrew and remove any heat shields.
   • Detach the exhaust pipes using a socket set.
2. Remove the catalytic converter by unscrewing the bolts that secure it.
3. Install the new catalytic converter:
   • Align the new converter with the exhaust pipes.
   • Torque the bolts to the specified torque settings (usually around 30 lb-ft).
4. Reattach heat shields and any other components removed.

4. Clear Codes and Test

1. Reconnect the negative battery terminal.
2. Use an OBD-II scanner to clear the P0420 code from the vehicle's computer.
3. Start the engine and allow it to reach operating temperature.