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!
SIERRA 1500 WITH 5.3L Y PIPE CONVERTER ASSEMBLY WITH 2 CONVERTERS TEST GROUP 3GMXT05.3176 LEV1 ULEV CALIFORNIA AND NEW YORK COMPLIANT EO D280-107 PER CARB REQUIREMENTS THE TEST GROUP SHOWN HERE MUST MATCH THE TEST GROUP OF YOUR VEHICLE. CALL FOR ASSISTANCE IF NEEDED (713)722-9212