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!
FORESTER WITH 2.5L UNDERBODY CONVERTER ASSEMBLY BOLTS TO ENGINE TEST GROUP CFJXJ02.5MXG LEV LEV2 CALIFORNIA APPROVED - CARB COMPLIANT PER CARB REQUIREMENTS THE TEST GROUP SHOWN HERE MUST MATCH THE TEST GROUP OF YOUR VEHICLE. CALL FOR ASSISTANCE IF NEEDED. EO NUMBER D798-9