Exemplary embodiments relate to a device (10) for monitoring data traffic with components of a motor vehicle (100), a motor vehicle (100), a device (20) for a network component (200) for monitoring a data transmission to at least one component of a motor vehicle (100), a method for monitoring data traffic with components of a motor vehicle (100), a method for a network component for monitoring a data transmission to at least one component of a motor vehicle (100), and corresponding computer programs. The vehicle device (10) for monitoring data traffic with components of a motor vehicle (100) in a motor vehicle (100) comprises one or more interfaces (12) which are designed to communicate with at least one transceiver (13a) of a first radio system (210) and to communicate with at least one transceiver (13b) of a second radio system (220). The device (10) also comprises a monitoring module (14) which is designed to receive information about a data transmission via the one or more interfaces (12) and the first ra
