how to troubleshoot P0420 code on Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather tools and parts required.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery for safety.

2. Inspect and Replace Oxygen Sensors

1. Remove the connectors from both the upstream and downstream oxygen sensors.
2. Use a socket wrench to remove the oxygen sensors from their respective locations.
3. Install new oxygen sensors:
   • Ensure to use the correct torque specifications (typically around 30 lb-ft).
   • Reconnect the electrical connectors securely.

3. Check and Replace Catalytic Converter

1. Inspect the catalytic converter for any physical damage or blockage. If damaged, proceed to replace.
2. Remove the exhaust pipes connected to the catalytic converter using a socket set.
3. Detach the catalytic converter from the exhaust system:
   • Use penetrating oil on bolts if rust is present.
   • Carefully remove the catalytic converter and set aside.
4. Install the new catalytic converter:
   • Ensure proper alignment with exhaust pipes.
   • Torque the bolts to manufacturer specifications (typically around 30-40 lb-ft).
5. Reattach the exhaust pipes, ensuring a tight seal.

4. Final Checks

• Reconnect the battery.
• Clear the P0420 code using the OBD-II scanner.
• Start the engine and allow it to reach operating temperature.