how to fix P0420 code on 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.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to ensure safety.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench, multimeter.
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the wiring harness from both sensors.
  3. Use the O2 sensor socket to remove the sensors.
  4. Inspect the sensors for damage; replace if necessary (ensure correct part number).
  5. Install new sensors and reconnect the wiring harness.

3. Examine and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, gasket scraper, exhaust sealant.
• Sub-steps:
  1. Locate the catalytic converter in the exhaust system.
  2. Remove any heat shields protecting the converter if applicable.
  3. Disconnect the exhaust pipes from the catalytic converter using a socket set.
  4. Remove mounting bolts and detach the catalytic converter.
  5. Clean the mounting surface on the exhaust system and remove old gasket material.
  6. Install a new catalytic converter, ensuring proper alignment.
  7. Secure with bolts and torque to manufacturer specifications.

4. Clear Codes and Test

• Tools Required: OBD-II scanner.
• Sub-steps:
  1. Reconnect the battery.
  2. Start the vehicle and allow it to reach operating temperature.
  3. Use the OBD-II scanner to clear the P0420 code.
  4. Take the vehicle for a test drive to monitor performance.