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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to avoid electrical shorts.
• Ensure the vehicle is on a level surface and properly supported with jack stands.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench, penetrating oil.
• Identify and locate the upstream and downstream oxygen sensors.
• Apply penetrating oil to the sensor threads and allow it to sit for a few minutes.
• Use the O2 sensor socket to remove the upstream oxygen sensor and inspect its condition.
• If damaged, replace it with a new sensor, ensuring to torque it to manufacturer specifications (typically around 30 ft-lbs).
• Repeat the process for the downstream sensor if necessary.

3. Check and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool.
• Locate the catalytic converter and inspect it for damage or blockages.
• If the converter is damaged, remove the bolts securing it to the exhaust system.
• Disconnect any exhaust hangers using the exhaust hanger removal tool.
• Install the new catalytic converter, ensuring to align it properly with the exhaust system.
• Torque the bolts to the specified value (typically around 25 ft-lbs).
• Reconnect any exhaust hangers and ensure the system is secure.

4. Clear Codes and Test

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
• Start the engine and allow it to reach operating temperature.
• Take the vehicle for a test drive, monitoring performance and the check engine light.