The most stressful part of getting a check engine light is not knowing the cause of the problem. This AutoScanner addresses that quickly, easily and best of all essentially "free" after the first several uses. It is sad how many auto service centers charge as much as $50 just to diagnose; a.k.a. scan the computer. Some part supply stores will scan for free and I applaud them. However; it is a good feeling to be able to scan and clear your own or your neighbors vehicle at any location because of it's portability.