how to fix P0420 code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface, and the ignition is turned off.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet and extensions, torque wrench.
• Sub-steps:
  1. Remove the upstream oxygen sensor from the exhaust manifold using the O2 sensor socket.
  2. Install the new upstream oxygen sensor and torque it to manufacturer specifications (usually around 30-40 lb-ft).
  3. Repeat the process for the downstream oxygen sensor, if necessary.
  4. Reconnect the negative battery terminal.

3. Inspect and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, exhaust clamp tool, torque wrench.
• Sub-steps:
  1. Disconnect the exhaust pipes connected to the catalytic converter using a socket set and exhaust clamp tool.
  2. Remove the catalytic converter from the mounting brackets.
  3. Install the new catalytic converter, ensuring it is secured properly to the mounting brackets.
  4. Reconnect the exhaust pipes, tightening them to the specified torque (typically around 25-30 lb-ft).
  5. Reconnect the negative battery terminal.

4. Clear Codes and Perform a Test Drive

• Tools Required: OBD-II scanner.
• Sub-steps:
  1. Use the OBD-II scanner to clear the error codes.
  2. Start the vehicle and allow it to reach operating temperature.
  3. Perform a test drive to ensure that the P0420 code does not reappear.