my Tesla Model S Original (2012-2020) has a P0420 code, what should I check?

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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, jack and jack stands, safety goggles, gloves.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Locate and remove the pre-catalytic converter oxygen sensor:
   • Use a socket wrench to unscrew the sensor from its position.
   • Disconnect the wiring harness from the sensor.
2. Install the new oxygen sensor:
   • Connect the wiring harness and screw the new sensor into place.
   • Torque it to the manufacturer's specifications (usually around 30 ft-lbs).
3. Repeat the process for the post-catalytic converter oxygen sensor if needed.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Raise the vehicle using a jack and secure it with jack stands.
2. Remove the exhaust heat shield (if applicable) to access the catalytic converter.
3. Unbolt the catalytic converter from the exhaust pipes:
   • Use a socket set to remove the bolts and disconnect any clamps.
4. Inspect the catalytic converter for any damage or blockage.
5. Install the new catalytic converter:
   • Position it in place, secure with bolts, and torque to the specified value.
6. Reattach the exhaust heat shield.

4. Reconnect Battery and Clear Codes

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