how to fix P0420 code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Oxygen Sensors

1. Remove the old oxygen sensors:
   • Locate the upstream and downstream oxygen sensors.
   • Use a socket wrench to unscrew the sensors from the exhaust system.
2. Install new oxygen sensors:
   • Apply anti-seize compound to the threads of the new sensors.
   • Hand-tighten the sensors, then use the socket wrench to secure them to the specified torque (typically 30 lb-ft).
3. Reconnect electrical connectors and verify they are secure.

3. Check and Replace Catalytic Converter (if necessary)

1. Remove the old catalytic converter:
   • Unbolt the catalytic converter from the exhaust system using a socket set.
   • Carefully detach any heat shields or brackets.
2. Inspect the exhaust pipes for blockages before installing the new catalytic converter.
3. Install the new catalytic converter:
   • Position the new catalytic converter and secure it with bolts.
   • Ensure all connections are tight and sealed.
   • Torque the bolts to the manufacturer's specifications (usually around 25 lb-ft).
4. Reattach any heat shields or brackets previously removed.

4. Clear Codes and Test

1. Reconnect the battery terminal and ensure everything is secure.
2. Use an OBD-II scanner to clear the P0420 code.
3. Start the engine and allow it to reach operating temperature.
4. Perform a test drive to ensure the check engine light does not reappear.