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!
RENDEZVOUS WITH 3.4L FWD ONLY CONVERTER ASSEMBLY TEST GROUP 5GMXT03.6143 LEV1 ULEV CA OR NY APPROVED - CARB EXECUTIVE ORDER D193-115 PER CARB REQUIREMENTS THE TEST GROUP SHOWN HERE MUST MATCH THE VEHICLE.