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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the vehicle's battery to prevent electrical issues.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, multimeter
• Sub-steps:
  • Locate the upstream and downstream oxygen sensors in the exhaust system.
  • Disconnect the electrical connectors from the sensors.
  • Remove the sensors using the O2 sensor socket.
  • Test the sensors with a multimeter to ensure they are functioning within specifications. Replace if faulty.
  • Install new sensors, torque to manufacturer specifications, and reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if necessary)
• Sub-steps:
  • Inspect the catalytic converter for damage or blockage.
  • If damaged, remove the catalytic converter by unbolting it from the exhaust system.
  • If necessary, use an exhaust pipe cutter to remove sections of the exhaust.
  • Install a new catalytic converter, ensuring proper alignment.
  • Torque all bolts to manufacturer specifications and reconnect any exhaust hangers.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle's battery.
• Use the OBD-II scanner to clear the P0420 code from the system.
• Start the vehicle and allow it to reach operating temperature.