how to fix P0420 code on Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0420 catalytic converter issues in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle's battery to ensure safety.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Safety glasses and gloves

2. Inspect and Replace Faulty Components

A. Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors connected to the exhaust system.
2. Disconnect the electrical connectors from the oxygen sensors.
3. Use the socket set to remove the sensors.
4. Inspect the sensors for damage; replace any that are faulty.
5. Install new oxygen sensors, tightening them to the manufacturer's specifications using the torque wrench.

B. Catalytic Converter

1. Check the condition of the catalytic converter visually for any physical damage.
2. If damaged, remove the catalytic converter by loosening the bolts or clamps that secure it to the exhaust system.
3. Install a new catalytic converter, ensuring all connections are secure.
4. Torque bolts to the manufacturer's specifications.

3. Reconnect Battery and Clear Codes

1. Reconnect the vehicle’s battery.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.
3. Ensure all electrical connections are secure and properly insulated.