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

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 battery to prevent any electrical issues during the repair.

2. Inspect and Replace Faulty Oxygen Sensors

• Sub-steps:
  1. Remove the electrical connectors from the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Use an oxygen sensor socket to remove the sensors from the exhaust manifold and catalytic converter.
  3. Install new oxygen sensors, applying anti-seize compound to the threads if recommended.
  4. Connect the electrical connectors securely.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Locate the catalytic converter and inspect the mounting hardware.
  2. Use a socket set to remove the bolts securing the catalytic converter to the exhaust system.
  3. Carefully remove the catalytic converter from the vehicle.
  4. Install the new catalytic converter, ensuring the gasket is in place.
  5. Torque the bolts to manufacturer specifications (check service manual for exact torque values).

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals securely.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
  3. Start the engine and allow it to reach operating temperature.