how to troubleshoot P0420 code on Tesla Model S Plaid/Refresh (2021-present)

Learn how to troubleshoot and fix P0420 code on Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect Oxygen Sensors

• Tools Required: OBD-II scanner, multimeter
• Disconnect the battery to prevent any electrical shorts.
• Remove the oxygen sensor connectors.
• Use a multimeter to test the resistance of the sensors. Compare with manufacturer specifications.
• Replace any faulty oxygen sensors.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust pipe cutter, exhaust sealant
• Raise the vehicle using jack stands and secure it.
• Disconnect the exhaust pipe from the catalytic converter using a socket set.
• Visually inspect the catalytic converter for damage or clogging.
• If necessary, cut the catalytic converter out using an exhaust pipe cutter.
• Install the new catalytic converter, ensuring it is aligned correctly.
• Tighten bolts to manufacturer specifications using a torque wrench.
• Apply exhaust sealant to prevent leaks.

4. Reconnect Oxygen Sensors

• Reconnect the oxygen sensors to their respective connectors.
• Ensure all wiring is secure and free of damage.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the system.
• Start the vehicle and let it idle to ensure no additional codes appear.