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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical issues.

2. Replace Oxygen Sensors

1. Locate the oxygen sensors: Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Remove the sensors: Use an O2 sensor socket to carefully unscrew the sensors from their housings.
3. Install new sensors: Apply anti-seize compound to the threads of the new oxygen sensors and install them securely.
4. Reconnect wiring: Ensure all electrical connections are secure and free from corrosion.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove the exhaust system components: Loosen and disconnect any clamps or bolts securing the exhaust pipe to the catalytic converter.
2. Take out the catalytic converter: Carefully unbolt the catalytic converter from its mounting points and remove it from the exhaust system.
3. Install the new catalytic converter: Position the new catalytic converter in place and secure it with the original or new bolts, following the manufacturer’s torque specifications.
4. Reattach exhaust components: Reconnect any parts removed during disassembly and ensure everything is tight and leak-free.

4. Reset the Engine Control Module (ECM)

1. Reconnect the battery: Ensure that all connections are secure.
2. Use the OBD-II scanner: Clear the P0420 code and any other stored codes from the ECM.