how to fix P0420 code on Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical issues.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Oxygen Sensors

1. Locate both upstream and downstream oxygen sensors.
2. Disconnect the wiring harness from each sensor.
3. Using an oxygen sensor socket, remove the sensors from the exhaust manifold and catalytic converter.
4. Install new oxygen sensors and torque to manufacturer specifications (typically around 30 ft-lbs).
5. Reconnect the wiring harness.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove any heat shields or protective covers over the catalytic converter.
2. Loosen and remove the mounting bolts securing the catalytic converter to the exhaust system using a socket set.
3. Carefully detach the catalytic converter from the exhaust pipes. If it’s stuck, use a penetrating oil to ease removal.
4. Install the new catalytic converter, ensuring correct orientation and fit.
5. Torque the mounting bolts to manufacturer specifications.
6. Reattach any heat shields or protective covers.

4. Clear Codes and Reconnect Battery

1. Use an OBD-II scanner to clear the P0420 code and any other stored codes.
2. Reconnect the negative battery terminal.