Haven't given this an extensive workout. As specified, it does not give you error code descriptions. But it is not that hard to look up the code in the book.I found that the 2006 Toyota Corolla I tried to diagnose must be using something beyond OBDC codes, because the "Maintenance" light does not register a code or clear out with this device (this Maint. light is not the same as the "Check Engine" light).That was disappointing, but Toyota's fault, not Actron's.