how to fix P0420 code in Tesla Model Y Current (2020-present)

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the vehicle to cool if it has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench.
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors on the exhaust manifold and catalytic converter.
  2. Disconnect the electrical connectors from both O2 sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust system.
  4. Install new oxygen sensors, ensuring they are properly torqued (typically around 30 lb-ft).
  5. Reconnect the electrical connectors securely.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust hangers tool.
• Sub-steps:
  1. Remove any heat shields covering the catalytic converter.
  2. Loosen and remove the bolts connecting the catalytic converter to the exhaust system using the socket set.
  3. Carefully detach the catalytic converter from the exhaust system.
  4. Install the new catalytic converter, ensuring proper alignment.
  5. Torque the bolts to the manufacturer's specification (usually around 25-30 lb-ft).
  6. Reinstall any heat shields that were removed.

4. Reconnect Battery and Clear Codes

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