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

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Gather all necessary tools and parts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, and torque wrench.
• Disconnect the negative battery terminal.
• Locate the upstream and downstream oxygen sensors on the exhaust system.
• Use the O2 sensor socket to remove the sensors.
• Install new sensors, ensuring proper torque (typically 30 Nm) and secure connections.

3. Inspect and Clean Catalytic Converter

• Tools Required: Exhaust system cleaner, brush, and safety goggles.
• If the catalytic converter is clogged but not damaged, use a cleaner to help dissolve carbon deposits.
• Pour the cleaner into the fuel tank as directed on the product label.
• Drive the vehicle for a specified distance as per the cleaner's instructions.

4. Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, and exhaust gasket.
• If the catalytic converter is damaged or cleaning fails, proceed with replacement.
• Unbolt the old catalytic converter from the exhaust system.
• Install the new catalytic converter using a new gasket and ensure that all bolts are torqued to manufacturer specifications (typically around 40 Nm).
• Reconnect any oxygen sensors that were removed.