my Tesla Model S Plaid/Refresh (2021-present) has a P0420 code what does it mean

Learn how to diagnose and fix P0420 catalytic converter issues in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts before starting.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench
• Remove the upstream and downstream oxygen sensors from the exhaust system.
• Inspect the sensors for any signs of damage or contamination.
• If faulty, install new oxygen sensors. Torque to the manufacturer's specifications.

3. Inspect the Catalytic Converter

• Tools Required: Jack and jack stands, exhaust pipe cutter (if necessary)
• Raise the vehicle and secure it with jack stands.
• Inspect the catalytic converter for physical damage, such as dents or rust.
• If damaged, remove it from the exhaust system using an exhaust pipe cutter or appropriate tools.
• Replace the catalytic converter with an OEM or equivalent part.

4. Reassemble and Reconnect

• Reconnect the exhaust components that were removed during the inspection.
• Ensure all connections are secure and free of leaks.
• Reconnect the negative battery terminal.

5. Clear Codes and Test

• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Start the engine and allow it to reach operating temperature.
• Perform a test drive to ensure the check engine light does not reappear.