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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Unplug the electrical connectors from the sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust system.
  4. Install new oxygen sensors and torque them to the manufacturer’s specifications (typically around 30 Nm).
  5. Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust gasket.
• Steps:
  1. Remove the heat shield covering the catalytic converter.
  2. Disconnect the exhaust pipes from the catalytic converter using a socket set.
  3. Remove the catalytic converter from its mounting.
  4. Inspect the new catalytic converter for any damage before installation.
  5. Install the new catalytic converter with a new exhaust gasket and torque the bolts to the specified value (typically around 40 Nm).
  6. Reinstall the heat shield if applicable.

4. Clear Codes and Test

• Tools Required: OBD-II scanner.
• Steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code.
  3. Start the vehicle and let it reach operating temperature.
  4. Take the vehicle for a test drive to ensure the check engine light does not reappear.