how to address the P0420 code on my Tesla Model S Plaid/Refresh (2021-present)

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's 12V battery to ensure safety.
• Allow the vehicle to cool down before working on the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench, multimeter
• Sub-steps:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors in the exhaust system.
  2. Disconnect the electrical connectors from the oxygen sensors.
  3. Use the O2 sensor socket to remove the sensors from their mounting locations.
  4. Install the new oxygen sensors, torqueing them to the manufacturer's specification (typically around 30 lb-ft).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, gasket scraper, exhaust sealant
• Sub-steps:
  1. Locate the catalytic converter in the exhaust system.
  2. Remove any heat shields or brackets securing the catalytic converter.
  3. Disconnect the exhaust pipes from the catalytic converter, using a socket set.
  4. Inspect the gasket and replace if necessary.
  5. Install the new catalytic converter, ensuring proper alignment.
  6. Torque the exhaust bolts to the manufacturer's specification (usually around 25 lb-ft).

4. Clear the Codes

• Reconnect the vehicle's 12V battery.
• Use the OBD-II scanner to clear the P0420 code and any other diagnostic trouble codes.