my Tesla Model Y Current (2020-present) shows code P0420, what does this mean?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to prevent electrical shock.
• Make sure the vehicle is on a level surface and secure it with jack stands if necessary.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the upstream and downstream oxygen sensors.
  • Unplug the electrical connectors from the sensors.
  • Remove the sensors using an oxygen sensor socket.
  • Install new oxygen sensors and torque them to the manufacturer's specifications (typically around 30 lb-ft).
  • Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter

• Sub-steps:
  • Remove the exhaust pipe connected to the catalytic converter.
  • Unbolt and remove the catalytic converter from its mounting.
  • Inspect the inside of the catalytic converter for signs of damage or clogging.
  • If necessary, install a new catalytic converter, ensuring to align it properly with the exhaust system.
  • Torque the bolts to the manufacturer's specifications (usually around 40 lb-ft).
  • Reattach the exhaust pipe.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0420 code and any other stored codes.