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

Solution

1. Preparation

• Gather tools and replacement parts.
• Disconnect the battery to ensure safety.
• Allow the vehicle to cool down if it has been running.

2. Inspect Oxygen Sensors

• Tools Needed: OBD-II scanner, multimeter
• Remove the connectors from the upstream and downstream oxygen sensors.
• Use a multimeter to test the voltage output of both sensors while the engine is running. The upstream sensor should fluctuate between 0.1 to 0.9 volts, while the downstream should be more stable.
• Replace any faulty oxygen sensors if necessary.

3. Check and Replace the Catalytic Converter

• Tools Needed: Socket set, torque wrench, exhaust pipe cutter (if needed)
• Raise the vehicle and secure it with jack stands.
• Locate the catalytic converter and inspect for damage or clogging.
• If replacement is needed, disconnect the exhaust pipes and any heat shields.
• Remove the old catalytic converter and install the new one, ensuring proper alignment.
• Torque all bolts to manufacturer specifications.

4. Reconnect Oxygen Sensors

• Reinstall the upstream and downstream oxygen sensors onto the new catalytic converter.
• Ensure the connectors are firmly connected and free from corrosion.

5. Clear Codes and Test Drive

• Tools Needed: OBD-II scanner
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code.
• Take the vehicle for a test drive under various conditions to ensure the code does not reappear.