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

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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical issues.
• Allow the vehicle to cool down before working on the exhaust system.

2. Inspect and Clean Oxygen Sensors

• Tools Required: O2 sensor socket, wire brush, cleaning solution.
• Remove the upstream and downstream oxygen sensors from the exhaust system.
• Clean the sensors with a wire brush and a suitable cleaning solution to remove any carbon buildup.
• Reinstall the sensors and ensure they are properly torqued to manufacturer specifications.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, wrench set, gasket scraper, torque wrench.
• If the catalytic converter is damaged or clogged, it needs to be replaced:
  1. Remove the exhaust manifold bolts and disconnect the exhaust pipes leading to the catalytic converter.
  2. Remove any mounting brackets or heat shields that obstruct access to the catalytic converter.
  3. Carefully detach the old catalytic converter from the exhaust system.
  4. Install the new catalytic converter in reverse order, ensuring all gaskets are intact and properly seated.
  5. Torque all bolts to the manufacturer specifications.

4. Clear Error Codes

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