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

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the 12V battery to prevent electrical hazards.
• Gather necessary tools and replacement parts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter.
• Remove the oxygen sensor(s) upstream and downstream of the catalytic converter.
  • Disconnect the electrical connectors carefully.
  • Use the O2 sensor socket to unscrew the sensors from the exhaust piping.
• Test the sensors with a multimeter for correct voltage output.
• If malfunctioning, replace with new sensors.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, exhaust pipe cutter, torch (if necessary for stubborn bolts).
• Remove the exhaust pipe connected to the catalytic converter.
  • Use a socket set to unbolt the connection points.
  • If rusted, apply penetrating oil to aid in removal.
• Remove the old catalytic converter and install the new unit.
  • Ensure proper alignment and secure with bolts to manufacturer specifications (consult service manual for torque values).
• Reconnect the exhaust pipe and ensure all connections are tight.

4. Clear Codes and Test

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the ECU.
• Start the vehicle and let it reach operating temperature.