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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the vehicle to cool if it has been recently driven.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Unplug the electrical connectors from both sensors.
3. Use a socket wrench to remove the sensors from the exhaust system.
4. Apply anti-seize compound to the threads of the new oxygen sensors.
5. Install the new sensors, tightening them to the manufacturer’s specifications (usually around 30 ft-lbs).
6. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. If the catalytic converter is confirmed faulty, locate the exhaust flange bolts connecting it to the exhaust system.
2. Remove any heat shields that may obstruct access.
3. Use a socket set to loosen and remove the flange bolts and any additional mounting hardware.
4. Carefully remove the old catalytic converter from the exhaust system.
5. Install the new catalytic converter, ensuring proper alignment and fit.
6. Reinstall the mounting hardware and heat shields, tightening them to manufacturer specifications.

4. Clear the Codes

1. Reconnect the battery.
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.