An FMCW radar sensor for motor vehicles, having a high frequency part for generating, transmitting and receiving radar signals, a modulation device for controlling the frequency modulation of the transmitted radar signal, at least one analog preprocessing stage for an intermediate frequency signal formed from the received radar signal, at least one analog/digital transducer stage, and a processor for controlling the modulation device and for further processing the digital signals of the analog/digital transducer stage, wherein the modulation device, the preprocessing stage and the analog/digital transducer stage are integrated into a single semiconductor component, which also has a monitoring device and registers for the configuration and monitoring of the components of the semiconductor component as well as an interface to the processor.