A faulty Oxygen Sensor is a primary reason for Failure of a Catalytic Converter. Car Manufacturers Recommend Replacement of O2 Sensors at 60,000 miles. If you are purchasing a New Catalytic Converter be sure the Oxygen Sensors are Checked and Operating Correctly!
ACADIA WITH 3.6L REAR UNDERBODY CONVERTER TEST GROUP 9GMXT03.6151 LEV2 ULEV CALIFORNIA OR NY APPROVED - CARB EXECUTIVE ORDER D191-148 PER CARB REQUIREMENTS THE TEST GROUP SHOWN HERE MUST MATCH THE TEST GROUP OF YOUR VEHICLE.