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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Ensure the vehicle is on a level surface and secure it with jack stands if elevated.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench
• Remove the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
• Visually inspect the sensors for damage or carbon buildup.
• If faulty, replace them with new sensors, ensuring they are torqued to the manufacturer’s specifications.

3. Check and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust gasket, torque wrench
• Remove the bolts securing the catalytic converter to the exhaust system using a socket set.
• Detach the catalytic converter from the exhaust system.
• Inspect the old catalytic converter for signs of damage or clogging.
• Install the new catalytic converter using a new gasket, ensuring proper alignment and torque to specifications.

4. Exhaust System Check

• Inspect all exhaust pipes and connections for leaks or damage.
• Replace any damaged pipes or gaskets as needed.
• Ensure all connections are secure and free from rust or corrosion.

5. Reconnect Battery and Clear Codes

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