As many of you know your vehicle manufacturer can fix many driveability problems electronically. This procedure is known as a re-flash or a reprogram of your computer, similar to a custom tune only done by the dealer or an independent repair shop that has the hardware <usually a laptop> and the software to do it. Usually if there's an issue and it's widespread the manufacturer will issue a TSB on the particular problem. If the problem isn't significant you may never know there is a flash for it unless you periodically check TSBs for your particulaar vehicles. The re-flash can repair engine, transmission, body and other electrical problems by changing the parameters the computer uses to control various inputs and outputs throught your vehicle. As your vehicle breaks in parts start to wear. This can cause unforseen problems such as idle problems, power problems, shifting problems, fuel mpg problems, torque converter problems and emission control problems that may or may not set trouble codes. Again this is why you should watch TSB lists for your vehicle to see if a reflash may fix a problem. In closing here's something most people do not know. When the manufacturer builds a re-flash they sometimes fix other things without posting a TSB. What happens is the manufacturer's hot line will get dealer techs calling in with problems that are not widespread. If they see a potential problem thay may incorporate a fix that is not listed just to cover the possibility of future problems. So when you get your computer re-flashed there may be several issues reprogrammed without any documentation. Or on the other hand if you have a drivability problem it may not be a bad idea to get your computer re-flashed even though there is no TSB on your particular problem. Dealers will not flash your computer unless there is a TSB so if you want it flashed you can take it to an independant shop,,,,,or,,,,,,complain about an issue that IS covered by a TSB.