how to fix P0420 code in my 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 parking brake is engaged.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Locate the upstream and downstream oxygen sensors.
• Using the O2 sensor socket, carefully unscrew the faulty oxygen sensor(s).
• Install new oxygen sensors and torque them to the manufacturer’s specifications (typically around 30 lb-ft).
• Reconnect the battery.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack stands, exhaust gasket, torque wrench
• Lift the vehicle and securely support it with jack stands.
• Locate the catalytic converter within the exhaust system.
• Remove the bolts securing the catalytic converter using a socket set.
• Carefully detach the catalytic converter from the exhaust system.
• Inspect the exhaust gasket and replace if damaged.
• Install the new catalytic converter and torque the bolts to the manufacturer's specifications.
• Reconnect any sensors or components removed during the process.