how to fix P0420 code on Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Oxygen Sensors

1. Access the Oxygen Sensors
   • Locate the oxygen sensors: one before the catalytic converter (upstream) and one after it (downstream).
   • Use a socket wrench to remove the oxygen sensors.
2. Test the Sensors
   • Using a multimeter, check the voltage output of the sensors. A faulty sensor should be replaced.
3. Replace the Sensors (if needed)
   • Install new oxygen sensors, ensuring to use anti-seize compound on the threads. Torque to specifications (typically around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter

1. Examine the Catalytic Converter
   • Look for signs of damage, such as dents or rust.
   • Check for clogs by shaking the converter; it should not rattle.
2. Remove the Catalytic Converter
   • Unbolt the catalytic converter from the exhaust system using the appropriate socket.
   • Ensure to keep any gaskets that are reusable.
3. Install the New Catalytic Converter
   • Position the new catalytic converter into place with new gaskets.
   • Bolt it securely to the exhaust system, ensuring proper torque (usually 25-30 lb-ft).

4. Reconnect and Reset

1. Reconnect the Battery
   • Reattach the negative terminal of the battery.
2. Clear Error Codes
   • Use the OBD-II scanner to clear the P0420 code.
3. Test Drive
   • Take the vehicle for a test drive to ensure the issue is resolved.