I HAVE CAME ACROSS THIS FAULT MANY TIMES OF ENG MANG LAMP ON AND FAULT CODES READING AGEING CATALYST I HAVE FIT NEW CATS BUT FROM AFTERMARKET SUPPLIERS BEFORE BUT THEY HAVE NEVER BEEN A GREAT SUCSESS HAS ANY BODY ANY OTHER IDEAS ON THIS SITUATION OR IS IT A MAIN DEALER PART ONLY THANKS IN ADV MALCOLM