how to fix P0420 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0420 catalytic converter efficiency 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, thermal camera or infrared thermometer, socket set.
• Disconnect the 12V battery and allow the vehicle to cool down before starting any work.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Use the OBD-II scanner to clear the P0420 code.
  2. Locate the upstream and downstream oxygen sensors.
  3. Disconnect the electrical connectors from both sensors.
  4. Remove the sensors using the appropriate socket.
  5. Install new oxygen sensors, tightening to manufacturer specifications (typically around 30 lb-ft).
  6. Reconnect electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Inspect the catalytic converter for physical damage or clogging.
  2. If damaged, remove the catalytic converter by unscrewing the flange bolts connecting it to the exhaust system.
  3. Install a new catalytic converter, ensuring proper alignment and tightening flange bolts to manufacturer specifications (typically around 25 lb-ft).
  4. Reconnect any exhaust brackets or hangers.

4. Final Checks

• Sub-steps:
  1. Reconnect the 12V battery.
  2. Start the vehicle and allow it to reach operating temperature.
  3. Use an OBD-II scanner to check for any new error codes.