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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical surges.
• Allow the vehicle to cool down before working on the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, penetrating oil.
• Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) 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 faulty sensors.
• Install the new sensors, tightening them to the manufacturer's specified torque (usually 30-40 ft-lbs).
• Reconnect the battery terminal.

3. Inspect and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, jack stands, exhaust gasket.
• Raise the vehicle and secure it on jack stands.
• Unbolt the exhaust system at the catalytic converter using the socket set.
• Remove any heat shields if necessary.
• Inspect the catalytic converter for physical damage or blockage.
• If replacement is required, install the new catalytic converter with an appropriate exhaust gasket.
• Tighten all bolts to the manufacturer’s specifications.

4. Clear Codes and Test

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.
• Start the engine and allow it to reach operating temperature.
• Test drive the vehicle under various conditions to ensure normal operation and check for the reappearance of the check engine light.