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!
MOUNTAINEER WITH 4.0L Y PIPE CONVERTER ASSEMBLY WITH TWO CONVERTERS TEST GROUP 1FMXT04.02F5 LEV LEV1 CALIFORNIA AND NEW YORK COMPLIANT EO D798 PER CARB REQUIREMENTS THE TEST GROUP SHOWN HERE MUST MATCH THE TEST GROUP OF YOUR VEHICLE. CALL FOR ASSISTANCE IF NEEDED (713)722-9212