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!
YUKON WITH 4.8L TEST GROUP 4GMXT05.3174 LEV ULEV CA OR NY APPROVED - CARB COMPLIANT D193-115 PER CARB REQUIREMENTS THE TEST GROUP SHOWN HERE MUST MATCH THE TEST GROUP OF YOUR VEHICLE. CALL FOR ASSISTANCE IF NEEDED (713)722-9212