Various embodiments include a system for calculating an error probability of a sensor data record in vehicles, the system comprising: a sensor unit with sensors in a vehicle, the sensor unit configured to provide a sensor data record for an object in an environment of the vehicle; a central computer receiving the sensor data record from the sensor unit; and a reference database storing reference data associated with a position of the vehicle noted at when the sensor data record was generated. The central computer is programmed to refer to reference data in the calculation of an error probability of the sensor data record.