my Tesla Outback 5th Generation (2015-2019) keeps throwing P0420 code what does it mean

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, multimeter, socket set, torque wrench, replacement oxygen sensors (if needed), and a new catalytic converter (if required).
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Oxygen Sensors (if faulty)

1. Locate the upstream and downstream oxygen sensors connected to the exhaust system.
2. Use a socket wrench to carefully remove the faulty sensor(s).
3. Install the new sensor(s) by threading them into the exhaust manifold or catalytic converter and tightening to the manufacturer's specified torque (typically around 30 lb-ft).
4. Reconnect the electrical connectors for the sensors.

3. Replace Catalytic Converter (if necessary)

1. Raise the vehicle using a jack and secure with jack stands.
2. Remove any heat shields or brackets securing the catalytic converter.
3. Unbolt the catalytic converter from the exhaust system using a socket set and remove it from the vehicle.
4. Install the new catalytic converter by positioning it correctly and securing it with the necessary bolts, torquing them to the manufacturer's specifications.
5. Reattach any heat shields or brackets that were removed.

4. Final Checks

1. Reconnect the negative battery terminal.
2. Start the vehicle and allow it to reach operating temperature.
3. Re-scan the vehicle using the OBD-II scanner to ensure the P0420 code is cleared.