how to fix P0420 code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather all required tools and parts.
• Disconnect the vehicle's battery to prevent electrical shock.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) O2 sensors.
2. Use an O2 sensor socket to remove the sensors.
3. Inspect the O2 sensor connectors for corrosion or damage.
4. Install new O2 sensors by screwing them into place; torque to manufacturer specifications (typically around 30 lb-ft).
5. Reconnect the O2 sensor connectors.

3. Inspect and Replace Catalytic Converter

1. Remove the heat shield covering the catalytic converter using a socket set.
2. Remove any mounting bolts securing the catalytic converter to the exhaust system.
3. Carefully disconnect the catalytic converter from the exhaust pipes; this may require cutting if bolts are seized.
4. Install the new catalytic converter and secure it with new gaskets and bolts; torque to manufacturer specifications (usually around 35 lb-ft).
5. Reattach the heat shield.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals securely.
2. Use the OBD-II scanner to clear the P0420 code from the system.
3. Start the vehicle and let it reach operating temperature.