how to fix the P0420 error in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on the vehicle.
• Raise the vehicle using jack stands and secure it on a flat surface.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench, multimeter
• Remove the upstream oxygen sensor (pre-catalytic converter) by using the O2 sensor socket and take note of its condition.
• Inspect the connector and wiring for damage; repair or replace as necessary.
• Install the new oxygen sensor, ensuring it is torqued to the manufacturer specifications (usually around 30 ft-lbs).
• Repeat the process for the downstream oxygen sensor (post-catalytic converter).

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, cutting tools (if needed)
• Disconnect the exhaust pipes connected to the catalytic converter using the socket set.
• Remove any mounting bolts or brackets securing the catalytic converter to the exhaust system.
• Carefully detach the catalytic converter from the exhaust system. If necessary, cut the exhaust pipe using appropriate cutting tools.
• Install the new catalytic converter, ensuring proper alignment and securing it with new gaskets and bolts as per the manufacturer's torque specifications (typically around 30 ft-lbs).
• Reconnect the exhaust system ensuring all connections are tight and leak-free.

4. Reset the Engine Control Module (ECM)

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 error code from the ECM.