OPCOM 2014 diagnostic tool for Opel cars covers almost all Opel cars, even new cars with CAN-BUS based diagnostic, such as Vectra-C, Astra-H, Zafira-B. opcom 2014 lets you read and clear fault codes, support many control units. It covers almost all Opel cars, even new cars with CAN-BUS based diagnostic, such as Vectra-C, Astra-H, Zafira-B.