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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Locate the upstream and downstream oxygen sensors.
• Use the O2 sensor socket to remove the faulty sensors (note their orientation).
• Install new oxygen sensors, ensuring they are properly torqued to the manufacturer's specifications (usually around 30 ft-lbs).
• Reconnect the battery.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust gasket, penetrating oil.
• Check for any damage or blockage in the catalytic converter.
• If replacement is necessary, remove the exhaust bolts connecting the catalytic converter to the exhaust system.
• Carefully detach the catalytic converter and replace it with a new unit, ensuring to use a new gasket.
• Torque the bolts to the manufacturer's specifications (typically around 25-30 ft-lbs).

4. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Perform a test drive to ensure that the code does not reappear and monitor the vehicle's performance.