Much like the operating system of a pc, the calibration files of an Engine Control Module (ECM) are updated from time to time, to ensure ideal performance as the vehicle ages.  These improvements, provided by the vehicle manufacturers, often repair issues affecting fuel economy, drivability and diognostics  Although car manufacturer engineers spend countless hours designing prior to the launch of their new models, component part design problems and long term wear under varying operating conditions can never be entirely forseen.
Inevitably corrections and improvements are needed.
These changes require updates that can be flash programmed into the vehicle ECM, improving both vehicle performance and your overall satisfaction.
Automotive Onboard Module Reprogramming
MODIS
Modular Diagnostic Information System
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When your "service engine soon" light appears on your dash, you know there's a problem, but what is it? The MODIS links with your cars onboard computer and scans for existing trouble codes, or problems, testing individual sensors and controls. 
Since its founding in 1987, Automotive Information Systems (AIS) Inc. has evolved into the nations best source for knowledge on what breaks, which vehicle it breaks on, and how to fix those vehicles correctly.  This knowledge is derived from continual analysis of data gathered from nearly 250,000 calls recieved each year from technitions around the world seeking assistance in diagnosing vehicle repair problems; a staff of 30+ factory certified, ASE master technicians; and the nations most comprehensive on-site library of factory vehicle service information.  AIS products and services are marketed under the brand name IDENTIFIX.
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