how to fix Tesla Model S Original (2012-2020) P0420 catalytic converter code

Learn how to diagnose and fix P0420 catalytic converter code in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the vehicle is parked on a level surface and secure it with wheel chocks.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench set, torque wrench.
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
  • Sub-steps:
    1. Disconnect the electrical connector from each sensor.
    2. Use the O2 sensor socket to unscrew the sensors from their mounting locations.
    3. Install the new sensors, hand-tighten, and then torque to manufacturer specifications (usually around 30 lb-ft).
    4. Reconnect the electrical connectors.

3. Replace Catalytic Converter (if defective)

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool.
• Remove the old catalytic converter.
  • Sub-steps:
    1. Loosen and remove the bolts securing the catalytic converter to the exhaust system.
    2. Use the exhaust hanger removal tool to detach the converter from the hangers.
    3. Remove the old gasket and clean the mating surfaces.
• Install the new catalytic converter.
  • Sub-steps:
    1. Place a new gasket on the mating surface.
    2. Position the new catalytic converter and attach it to the exhaust system.
    3. Torque all bolts to the specified manufacturer values (typically 30-40 lb-ft).
    4. Reattach the exhaust hangers securely.

4. Reset Engine Control Unit (ECU)

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the ECU.