how to address Tesla Model Y Current (2020-present) P0420 code issues

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 battery to prevent electrical issues during repairs.

2. Inspect and Replace Oxygen Sensors

• Remove the old oxygen sensors:
  • Use an O2 sensor socket to remove the upstream and downstream sensors.
• Install new oxygen sensors:
  • Apply anti-seize compound to the threads of the new sensors.
  • Torque the sensors to the manufacturer's specifications (typically around 30 lb-ft).

3. Inspect and Replace Catalytic Converter

• Remove the exhaust components:
  • Use a socket set to unbolt the exhaust pipe connections.
  • Carefully detach the catalytic converter from the exhaust system.
• Install the new catalytic converter:
  • Align the new catalytic converter with the exhaust system.
  • Use new gaskets and bolts as necessary, torquing to manufacturer's specifications.

4. Reconnect Battery and Reset Codes

• Reconnect the battery terminals, ensuring they are tight.
• Use the OBD-II scanner to clear the P0420 code and other related codes.

5. Test Drive

• Conduct a test drive to monitor for any reoccurrence of the P0420 code and ensure the check engine light remains off.