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

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery for safety.

Tools Required:

• OBD-II scanner
• Multimeter
• Back pressure gauge
• Socket set
• Torque wrench

2. Inspect and Replace Oxygen Sensors

• a. Locate the oxygen sensors: Find the upstream (pre-catalytic converter) and downstream (post-catalytic converter) sensors.
• b. Disconnect the connectors from both oxygen sensors.
• c. Remove the sensors using a wrench and inspect them for damage.
• d. Replace any faulty sensors with new ones, ensuring they are correctly torqued (typically around 30 ft-lbs).
• e. Reconnect the battery and clear the codes with the OBD-II scanner.

3. Inspect and Replace the Catalytic Converter

• a. Remove the exhaust pipe connected to the catalytic converter. This may require heating the bolts to loosen them if they are rusted.
• b. Inspect the catalytic converter for any physical damage or clogging.
• c. Remove the old catalytic converter by unbolting it from the exhaust manifold and the exhaust pipe.
• d. Install the new catalytic converter, ensuring a proper fit and using new gaskets or seals as necessary.
• e. Reassemble the exhaust system, tightening all bolts to the manufacturer’s torque specifications (typically around 25-30 ft-lbs).