how to fix P0420 code on 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 12V battery to ensure safety while working on electrical components.

2. Inspect and Clean Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Remove the sensors using an oxygen sensor socket.
3. Inspect the sensors for carbon buildup or damage.
4. Clean the sensors with a specialized sensor cleaner or replace them if necessary.
5. Reinstall the sensors and torque to manufacturer specifications (typically around 30-40 ft-lbs).

3. Examine the Catalytic Converter

1. Visually inspect the catalytic converter for any dents or signs of overheating.
2. If damaged, remove the catalytic converter by unbolting it from the exhaust system.
   • Tools: Socket set, torque wrench
3. Install a new catalytic converter ensuring proper alignment.
4. Torque the bolts to manufacturer specifications (usually between 30-40 ft-lbs).

4. Reconnect Battery and Clear Codes

1. Reconnect the 12V battery.
2. Use the OBD-II scanner to clear the P0420 code.
3. Start the vehicle and allow it to reach operating temperature.