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

Learn how to diagnose and fix P0420 catalytic converter efficiency 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 vehicle battery to ensure safety.
• Allow the vehicle to cool down completely before working on the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench.
• Remove the upstream (pre-catalytic) oxygen sensor:
  1. Disconnect the electrical connector.
  2. Use the O2 sensor socket to unscrew the sensor.
  3. Install the new sensor and torque it to the manufacturer's specifications (typically around 30 lb-ft).
• Repeat for the downstream (post-catalytic) oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, cutting tool (if welding is needed), new gaskets.
• Remove the catalytic converter:
  1. Loosen and remove the bolts securing the catalytic converter to the exhaust system.
  2. If welded, cut the old converter out carefully.
• Install the new catalytic converter:
  1. Position the new converter in place, using new gaskets if applicable.
  2. Secure with bolts and torque to manufacturer specifications.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0420 code and any related codes.