my Tesla Model S Original (2012-2020) has a P0420 code, what should I check?

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to avoid electrical issues while working on the exhaust system.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench set, torque wrench, shop rag.
• Remove the oxygen sensors from their respective locations (before and after the catalytic converter).
• Inspect the sensors for signs of wear or damage.
• If faulty, install new oxygen sensors by reversing the removal process. Torque to the manufacturer's specifications (typically around 30 ft-lbs).

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter (if needed).
• Raise the vehicle securely using jack stands.
• Remove any heat shields covering the catalytic converter.
• Detach the exhaust pipes connected to the catalytic converter using a socket set.
• Remove the catalytic converter by unbolting it from the exhaust manifold and mid-pipe.
• Install the new catalytic converter, ensuring all gaskets and seals are replaced.
• Reattach the exhaust system, tightening bolts to the specified torque.

4. Reconnect Battery

• Reconnect the vehicle's battery and ensure all connections are secure.

5. Clear Codes

• Use the OBD-II scanner to clear the trouble codes from the vehicle's computer.