how to fix P0420 code on Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace Oxygen Sensors

• Check O2 Sensor Functionality:
  • Use a multimeter to test the voltage output of the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  • If the upstream sensor is faulty (not switching between 0.1V - 0.9V), replace it.
• Replacement:
  • Locate the upstream O2 sensor, unplug the connector, and remove it using an O2 sensor socket.
  • Install the new sensor and reconnect the wiring harness.

3. Inspect and Replace the Catalytic Converter

• Remove Old Catalytic Converter:
  • Loosen the exhaust clamps and bolts securing the catalytic converter.
  • Detach it from the exhaust piping and remove it from the vehicle.
• Install New Catalytic Converter:
  • Position the new catalytic converter in place.
  • Secure it with bolts and clamps to the exhaust system according to manufacturer's specifications (usually around 30-35 lb-ft torque).

4. Reconnect Battery and Clear Codes

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