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

Learn how to diagnose and fix P0420 exhaust system issue in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery.
• Ensure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect and Replace O2 Sensors

• Sub-steps:
  1. Locate the upstream (before the catalytic converter) and downstream (after the catalytic converter) O2 sensors.
  2. Use a socket wrench to carefully remove the O2 sensors.
  3. Install new O2 sensors, torque to manufacturer specifications (typically around 30 lb-ft).
  4. Reconnect the electrical connectors.

3. Inspect or Replace the Catalytic Converter

• Sub-steps:
  1. Remove any heat shields or brackets securing the catalytic converter.
  2. Detach the catalytic converter from the exhaust system using a wrench or socket set.
  3. Inspect for any internal damage or blockage; if found, replace with an OEM or compatible catalytic converter.
  4. Reinstall the catalytic converter and secure with bolts, torquing to specifications.

4. Clear the Codes

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Use the OBD-II scanner to clear the P0420 code and any related codes.
  3. Start the engine and allow it to reach operating temperature.