how to fix P0420 code on my Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0420 catalytic converter issues in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, multimeter.
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
• Inspect the threads and connectors of the removed sensors for wear.
• If faulty, install new oxygen sensors by threading them into their respective locations and tightening to manufacturer's torque specifications (usually around 30-40 lb-ft).
• Reconnect the wiring harness securely.

3. Check and Replace the Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust gasket.
• Raise the vehicle using jack stands for safety.
• Remove any heat shields or brackets obstructing the catalytic converter.
• Disconnect the exhaust pipes from the catalytic converter.
• Inspect the catalytic converter for signs of damage or clogging; if the substrate is broken or restricted, replace the catalytic converter.
• Install the new catalytic converter with a new gasket, ensuring it is seated properly.
• Reattach the exhaust pipes and any heat shields or brackets removed.

4. Clear Error Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Start the vehicle and let it idle for a few minutes.