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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Oxygen Sensors

1. Locate the Oxygen Sensors: Identify the upstream (pre-catalytic) and downstream (post-catalytic) O2 sensors.
2. Remove the O2 Sensors: Using an O2 sensor socket, carefully unscrew both sensors from the exhaust system.
3. Inspect the Sensors: Check for signs of damage or contamination.
4. Replace if Necessary: Install new oxygen sensors, making sure to use anti-seize compound on the threads.
5. Torque to Specification: Tighten the sensors to the manufacturer’s torque specifications (usually around 30 ft-lbs).

3. Inspect and Replace Catalytic Converter

1. Check for Exhaust Leaks: If leaks are present, repair them before replacing the catalytic converter.
2. Remove the Exhaust System: Unbolt the exhaust pipes leading to and from the catalytic converter, using a socket set.
3. Remove the Catalytic Converter: Take out the old catalytic converter, ensuring to note the placement of any gaskets.
4. Install New Catalytic Converter: Position the new catalytic converter in place, replacing any gaskets as necessary.
5. Reassemble Exhaust System: Reattach the exhaust pipes, ensuring all bolts are tightened to the specified torque.

4. Clear the Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s memory.