how to fix P0420 code on Tesla Model Y Current (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to prevent any electrical shorts while working.

2. Inspect and Replace Oxygen Sensors (if needed)

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from the sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust system.
  4. Install new oxygen sensors by tightening to the manufacturer’s specified torque (typically around 30 lb-ft).
  5. Reconnect the electrical connectors.

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

• Tools Required: Socket set, exhaust pipe cutter (if necessary), torque wrench.
• Sub-steps:
  1. Locate the catalytic converter in the exhaust system.
  2. Use a socket set to unbolt the catalytic converter from the exhaust pipe (note if the exhaust requires cutting).
  3. Inspect the old catalytic converter for damage or clogging.
  4. Install the new catalytic converter and secure it with bolts, torquing to the manufacturer’s specifications.
  5. Ensure all exhaust connections are sealed properly and not leaking.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Perform a drive cycle to allow the vehicle to re-check emissions system readiness.