how to fix 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, multimeter, socket set, torque wrench, exhaust gaskets
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Identify the upstream and downstream oxygen sensors.
2. Use a socket wrench to remove the oxygen sensors from the exhaust manifold and catalytic converter.
3. Inspect the sensors for damage or contamination. Replace if necessary.
4. Install new oxygen sensors, tightening to the manufacturer’s specified torque (typically around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter

1. Remove any bolts or clamps securing the catalytic converter to the exhaust system using a socket set.
2. Carefully lower the catalytic converter from its mounting position.
3. Inspect the old catalytic converter for signs of failure, such as a rattling noise or excessive soot buildup.
4. Install the new catalytic converter, ensuring that all gaskets are properly seated.
5. Tighten all mounting bolts to the specified torque (usually around 25 lb-ft).

4. Reconnect Battery and Clear Codes

1. Reconnect the negative battery terminal securely.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.
3. Start the vehicle and allow it to reach normal operating temperature.