TL* THE CONTACT OWNS A 2001 FORD F-150. THE CONTACT STARTED THE IGNITION AND LIGHT GREY SMOKE EMITTED FROM THE EXHAUST. THE FAILURE WAS INTERMITTENT AND BECAME PROGRESSIVELY WORSE. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER THREE TIMES FOR THE IDENTICAL FAILURE. THE CATALYTIC CONVERTER AND ENGINE HEAT CONTROL SENSOR WERE REPLACED AT THE OWNER'S EXPENSE. THE FAILURE CONTINUED AFTER THE REPAIR WAS PERFORMED ON THE VEHICLE. THE FAILURE MILEAGE WAS 118,042.