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

Learn how to diagnose and fix P0420 catalytic converter 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.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor:
  1. Locate the upstream O2 sensor (usually before the catalytic converter).
  2. Use the O2 sensor socket to unscrew the sensor.
  3. Install the new O2 sensor and tighten it to the manufacturer's specifications (typically around 30-40 lb-ft).
• Repeat for the downstream O2 sensor if necessary.

3. Check and Replace the Catalytic Converter (if needed)

• Tools Required: Socket set, torque wrench, exhaust gasket sealant.
• Remove the catalytic converter:
  1. Loosen the exhaust clamps and bolts securing the catalytic converter to the exhaust system.
  2. Carefully remove the catalytic converter from the exhaust pipes.
• Install a new catalytic converter:
  1. Position the new catalytic converter in place and secure it using the original bolts and clamps.
  2. Tighten the bolts to the specified torque (usually around 30-40 lb-ft).
  3. Apply exhaust gasket sealant to ensure a proper seal.

4. Reconnect Battery and Clear Codes

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