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

Solution

1. Preparation

• Gather necessary tools and parts needed for repair.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Replace Oxygen Sensors

• Locate the upstream and downstream oxygen sensors along the exhaust system.
• Using an O2 sensor socket, carefully remove the upstream oxygen sensor.
• Inspect the sensor for damage; if faulty, replace it with a new part.
• Repeat the process for the downstream oxygen sensor if necessary.

3. Evaluate and Replace Catalytic Converter

• Inspect the catalytic converter for signs of physical damage or blockage.
• If the catalytic converter is defective, remove the exhaust system components as needed to access it.
• Unbolt the catalytic converter from the exhaust manifold and downstream piping.
• Install the new catalytic converter, ensuring the gaskets are in good condition and properly aligned.
• Torque the bolts to the manufacturer’s specifications.

4. Reassemble Exhaust System

• Reattach any exhaust components that were removed for access.
• Make sure all connections are secure and there are no exhaust leaks.
• Reconnect the oxygen sensors to their respective connectors.

5. Finalize and Reset

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer system.
• Start the engine and allow it to reach operating temperature.