how to fix P0420 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0420 exhaust system issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to prevent electrical issues.
• Allow the vehicle to cool down if the engine has been running.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Using a socket wrench, remove the upstream oxygen sensor from its position.
3. Install the new upstream oxygen sensor and tighten it to the manufacturer's specified torque (typically around 30 ft-lbs).
4. Repeat the process for the downstream oxygen sensor if necessary.
5. Reconnect the battery.

3. Inspect the Catalytic Converter

1. Visually inspect the catalytic converter for signs of damage, such as dents or rust.
2. If the catalytic converter appears damaged or you suspect it is clogged, remove it from the exhaust system.
3. Inspect the internal structure of the catalytic converter for signs of melting or disintegration.
4. If necessary, replace the catalytic converter with a quality OEM or aftermarket part.
5. Reinstall the catalytic converter and ensure all connections are secure.

4. Clear Fault Codes

1. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
2. Start the vehicle and allow it to reach operating temperature.