TL*THE CONTACT OWNS A 2005 MERCURY SABLE. THE CONTACT STATES THAT WHILE DRIVING APPROXIMATELY BETWEEN 45-50 MPH ON NORMAL ROAD CONDITIONS. THE VEHICLE BEGAN TO SHAKE AND VIBRATE EXCESSIVELY. THE FAILURES OCCURRED THE FOLLOWING DAY AND THE CHECK ENGINE WARNING LIGHT INDICATOR ILLUMINATED ON THE INSTRUMENT PANEL. THE FAILURES OCCURRED WITHOUT WARNING. THE WARNING INDICATOR ILLUMINATED UNTIL THE ENGINE WAS TURNED OFF. THE CONTACT WAS IN THE PROCESS OF TAKING THE VEHICLE TO AN AUTHORIZED DEALER FOR INSPECTION. THE FAILURE AND CURRENT MILEAGES WERE 73,000.