how to fix the P0420 code on my Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0420 exhaust system issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, safety glasses, gloves.
• Safety Warnings: Ensure the vehicle is turned off and cooled down before working on the exhaust system.

2. Inspect and Replace Oxygen Sensors (if faulty)

1. Disconnect the vehicle’s battery to prevent electrical shorts.
2. Locate the oxygen sensors: one upstream (before the catalytic converter) and one downstream (after the catalytic converter).
3. Use a socket wrench to remove the oxygen sensors from their respective locations.
4. Test the sensors with a multimeter to check for proper voltage output (typically between 0.1V and 0.9V; specific values may vary).
5. If faulty, install the new oxygen sensors in reverse order of removal. Ensure they are torqued to the manufacturer's specifications.

3. Inspect and Replace the Catalytic Converter (if necessary)

1. If the catalytic converter is damaged or clogged, it should be replaced.
2. Disconnect any exhaust pipes attached to the catalytic converter using a socket set.
3. Remove the catalytic converter from the vehicle, noting the orientation for installation of the new unit.
4. Install the new catalytic converter, ensuring all gaskets are new and properly seated.
5. Reattach exhaust pipes and torque to the manufacturer’s specifications.

4. Clear Codes and Test

1. Reconnect the vehicle's battery.
2. Use the OBD-II scanner to clear any fault codes.
3. Start the vehicle and allow it to run for a few minutes to check for the reappearance of the P0420 code.