Tyre pressure sensor for motor vehicles, comprising: a housing, an integrated circuit (sensor IC) accommodated in the housing, wherein the sensor IC includes a microcontroller and a pressure sensor, wherein means (6, 9; 7, 10) for wireless communication, which are coupled with the microcontroller, are arranged in the housing in order to transmit pressure values measured by means of the pressure sensor to a remote receiver device, wherein the sensor IC has an internal memory in which executable instructions and data are stored, which, on being executed, initiate the measurement and transmission of measured pressure values, wherein a voltage supply is arranged in the housing and is coupled with the sensor IC, wherein the sensor IC is coupled with an additional memory module arranged in the housing, wherein a plurality of different data packets, each containing instructions or data, are stored in the memory module, characterised in that the additional memory module can be actuated by the microcontroller, in order to copy a selected data packet into the internal memory, and the microcontroller is coupled with the means for wireless communication such that a selection of a data packet stored in the additional memory takes place via the means for wireless communication and the microcontroller then copies the selected data packet from the additional memory into the internal memory, wherein the microcontroller controls the voltage supply of the additional memory module such that the additional memory can be switched into an energy-saving mode and wherein the microcontroller switches into the energy-saving mode of the additional memory after a selected data packet has been copied from the additional memory into the internal memory. a housing, an integrated circuit (sensor IC) accommodated in the housing, wherein the sensor IC includes a microcontroller and a pressure sensor, wherein means (6, 9; 7, 10) for wireless communication, which are coupled with the microcontroller, are arranged in the housing in order to transmit pressure values measured by means of the pressure sensor to a remote receiver device, wherein the sensor IC has an internal memory in which executable instructions and data are stored, which, on being executed, initiate the measurement and transmission of measured pressure values, wherein a voltage supply is arranged in the housing and is coupled with the sensor IC, wherein the sensor IC is coupled with an additional memory module arranged in the housing, wherein a plurality of different data packets, each containing instructions or data, are stored in the memory module, characterised in that the additional memory module can be actuated by the microcontroller, in order to copy a selected data packet into the internal memory, and the microcontroller is coupled with the means for wireless communication such that a selection of a data packet stored in the additional memory takes place via the means for wireless communication and the microcontroller then copies the selected data packet from the additional memory into the internal memory, wherein the microcontroller controls the voltage supply of the additional memory module such that the additional memory can be switched into an energy-saving mode and wherein the microcontroller switches into the energy-saving mode of the additional memory after a selected data packet has been copied from the additional memory into the internal memory.