The disclosure relates to a plug-in connector including a housing having at least two contact terminals received in adjacent terminal receiving cavities. An electric identification device is arranged in the housing and adapted to simultaneously contact the at least two terminals. The electric identification device including a unique identifier, wherein one of the at least two terminals is an output terminal of the identification device, and wherein the unique identifier of the electric identification device is adapted to be read out via the output terminal for authenticating an original equipment manufacturer's parts, such as a plug-in authenticator.