how to resolve the P0420 code issue in my Tesla Outback 4th Generation (2010-2014)?

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the vehicle battery to prevent electrical shorts.
• Allow the exhaust system to cool down before beginning work.

2. Inspect and Replace Components

• Inspect the Catalytic Converter
  • Visually check for any dents, holes, or rust.
  • If damaged, proceed to replace the catalytic converter.
• Replace Oxygen Sensors (if necessary)
  • If any sensors are faulty based on the diagnostic tests, follow these sub-steps:
    1. Locate the upstream and downstream oxygen sensors on the exhaust manifold and behind the catalytic converter.
    2. Use an oxygen sensor socket to remove the faulty sensor.
    3. Apply anti-seize compound to the threads of the new sensor.
    4. Install the new sensor and torque it to the manufacturer’s specifications (typically around 30 lb-ft).

3. Reassemble and Test

• Reinstall any components removed for access.
• Reconnect the vehicle battery.
• Clear the codes using an OBD-II scanner.
• Start the engine and allow it to reach operating temperature.