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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to avoid any electrical shorts.
• Allow the vehicle to cool down before working on the exhaust components.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream (pre-catalytic converter) oxygen sensor by using the O2 sensor socket.
• Inspect the sensor for damage; if it appears faulty, replace it with a new one.
• Install the new sensor and torque it to the manufacturer’s specifications (typically around 30 lb-ft).
• Repeat for the downstream (post-catalytic converter) oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust sealant
• Remove the exhaust pipes connected to the catalytic converter using the socket set.
• Check the catalytic converter for blockages or signs of failure.
• If it is damaged or clogged, remove the old catalytic converter.
• Install the new catalytic converter, ensuring proper alignment.
• Reattach the exhaust pipes and torque them to specifications.
• Use exhaust sealant on joints to prevent leaks.

4. Clear Codes and Test

• Reconnect the battery and use the OBD-II scanner to clear the P0420 code.
• Start the engine and let it idle to ensure no codes return.
• Perform a test drive to monitor the vehicle's performance and check for the check engine light.