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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's 12V battery to prevent electrical shock.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
• Inspect the sensors for damage or contamination.
• If faulty, replace with OEM equivalent sensors and torque to manufacturer specifications (usually around 30-40 ft-lbs).

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, exhaust gasket, torque wrench
• Remove the exhaust bolts securing the catalytic converter to the exhaust system.
• Carefully detach the catalytic converter, ensuring not to damage surrounding components.
• Inspect the old catalytic converter for signs of clogging or damage.
• Install the new catalytic converter with a new gasket, ensuring all bolts are torqued to manufacturer specifications (typically 25-30 ft-lbs).

4. Clear Codes and Test Drive

• Reconnect the battery and use the OBD-II scanner to clear the P0420 code.
• Test drive the vehicle under various conditions (city and highway) to ensure the issue is resolved.