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

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical issues.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Using the O2 sensor socket, remove the sensors from the exhaust system.
  4. Install new oxygen sensors into the exhaust system, tightening them to the manufacturer’s specified torque.
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust hanger tool, torque wrench
• Sub-steps:
  1. Remove any heat shields or covers over the catalytic converter.
  2. Disconnect the exhaust pipes from the catalytic converter using the socket set.
  3. Support the catalytic converter and remove any mounting bolts.
  4. Install the new catalytic converter, ensuring proper alignment and fit.
  5. Reconnect the exhaust pipes and tighten the bolts to the manufacturer's specified torque.
  6. Reinstall any heat shields or covers removed earlier.

4. Reset the Engine Control Module

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the negative terminal of the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the ECM.
  3. Start the vehicle and let it run for a few minutes to ensure proper initialization.