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

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the vehicle’s battery to prevent electrical issues.
• Allow the vehicle to cool down if it has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, and torque wrench.
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
• Inspect the sensor wiring for damage or corrosion.
• If damaged, replace the sensors with OEM or quality aftermarket parts.
• Torque the new sensors to manufacturer specifications (typically around 30 ft-lbs, but verify with specific part instructions).

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust sealant.
• Raise the vehicle using a jack and secure it with jack stands.
• Remove any heat shields if necessary.
• Unbolt the catalytic converter from the exhaust system and carefully remove it.
• Inspect the replacement catalytic converter for proper fit and compatibility.
• Install the new catalytic converter, ensuring gaskets are in good condition or replaced.
• Torque the bolts to the manufacturer’s specifications.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle's battery terminals.
• Use the OBD-II scanner to clear the P0420 code.
• Start the vehicle and allow it to reach operating temperature.