TL*THE CONTACT OWNS A 2005 MERCEDES BENZ S430. WHILE PARKED, THE CONTACT TURNED THE IGNITION AND TOOK THE KEY OUT OF THE VEHICLE BUT THE IGNITION CONTINUED TO RUN. THE CONTACT NOTICED SMOKE COMING FROM UNDER THE HOOD. THE CONTACT OPENED THE HOOD AND NOTICED FLAMES. THE FIRE DEPARTMENT WAS CALLED. THE FIRE DEPARTMENT ARRIVED AND DID NOT NOTICE A FLAME BUT PULLED THE VEHICLE OUT OF THE DRIVE WAY DUE TO FEAR IT COULD EXPLODE. THE VEHICLE SHUT OFF ON ITS OWN. THE VEHICLE WAS TOWED TO A CERTIFIED MECHANIC. THE AIR PUMP AND AIR MODULE PUMP COMPRESSOR WERE REPLACED. THE APPROXIMATE FAILURE MILEAGE WAS 90,000.