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

Solution

1. Preparation

• Gather all tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Replace Oxygen Sensors

1. Locate the Oxygen Sensors: Identify the upstream and downstream oxygen sensors in the exhaust system.
2. Unplug the Sensors: Carefully disconnect the wiring harness from each oxygen sensor.
3. Remove the Sensors: Use an oxygen sensor socket to unscrew and remove the sensors from the exhaust pipe.
4. Install New Sensors: Apply anti-seize compound on the threads of the new sensors, then install and torque to manufacturer specifications (usually around 30 lb-ft).
5. Reconnect Wiring: Plug the wiring harness back into each oxygen sensor.

3. Inspect and Replace Catalytic Converter

1. Remove Exhaust Components: If the catalytic converter is damaged, remove any mounting bolts or clamps holding it in place using a socket set.
2. Detach the Converter: Carefully remove the catalytic converter from the exhaust system.
3. Inspect Gaskets: Check and replace any gaskets or seals that may be worn.
4. Install New Catalytic Converter: Position the new catalytic converter, ensuring proper alignment, and secure it with new bolts or clamps.
5. Reconnect Exhaust System: Reattach any components removed earlier, ensuring all connections are tight and secure.

4. Clear Codes and Test

1. Reconnect the Battery: Reconnect the negative battery terminal.
2. Clear the Codes: Use an OBD-II scanner to clear the P0420 code from the ECU.
3. Test Drive the Vehicle: Drive the vehicle for a short distance to allow the ECU to re-read sensor data.