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

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the vehicle battery to ensure safety.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream (pre-catalytic) oxygen sensor using the O2 sensor socket.
• Inspect the sensor for damage; if faulty, replace it with a new one, tightening to the manufacturer's torque specification (usually around 30 lb-ft).
• Repeat the removal and inspection for the downstream (post-catalytic) oxygen sensor. Replace if necessary.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, cutting tools (if necessary), gasket sealant
• Remove the exhaust pipe connected to the catalytic converter, ensuring to collect any bolts or nuts for reuse.
• If there is any blockage or damage to the catalytic converter, remove it from the exhaust system.
• Install the new catalytic converter, ensuring a proper fit and sealing any joints with gasket sealant if required.
• Reattach the exhaust pipe and tighten all connections to the manufacturer's specifications.

4. Clear Codes and Test Drive

• Reconnect the vehicle battery.
• Use an OBD-II scanner to clear the P0420 code from the system.
• Test drive the vehicle for at least 20 minutes under varied conditions to ensure proper operation.