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!
ENVOY WITH 4.2L AND 129 INCH WB TEST GROUP 3GMXA04.2187 LEV LEV1 OR 3GMXTO4.2185 LEV LEV1 CA OR NY APPROVED - CARB COMPLIANT D798-7 PER CARB REQUIREMENTS THE TEST GROUP SHOWN HERE MUST MATCH THE TEST GROUP OF YOUR VEHICLE. CALL FOR ASSISTANCE IF NEEDED (713)722-9212