Method for determining a blindness (BLi) of each sensor in a sensor group having at least one sensor of a plurality of sensors which are fitted to a vehicle and are each designed to emit and receive ultrasonic signals, characterized by the following steps: carrying out a plurality of mutually independent measurements (Mil, Mi2, Mi3, Mi4) for each sensor in the sensor group, during which at least one blindness risk (BRil, BRi2, BRi3, BRi4, BRi5) is respectively determined for the corresponding sensor on the basis of an evaluation of a physical variable of the corresponding sensor or on the basis of an evaluation of ultrasonic signals received by means of the corresponding sensor, and determining a blindness (BLi) and an associated confidence (Ki) of each sensor in the sensor group in each case on the basis of the blindness risks (BRil, BRi2, BRi3, BRi4, BRi5) determined for the corresponding sensor, characterized in that a first measurement of the plurality of measurements (Mil, Mi2, Mi3, Mi4) is carried out for each sensor in the sensor group with the following steps: repeatedly measuring an impedance value (ZWi) of an impedance of the corresponding sensor, and determining a first blindness risk for the corresponding sensor on the basis of an evaluation of its measured impedance values (ZWi), and measuring a first signal level (CPil) of ground clutter signals which are produced as a result of emission of ultrasonic signals- and are received by means of the corresponding sensor, and carrying out a further measurement of the plurality of measurements (Mil, Mi2, Mi3, Mi4) to be carried out for the corresponding sensor using a plurality of the first signal levels (CPil) measured for at least one sensor in the sensor group, wherein the further measurement to be carried out for each sensor in the sensor group comprises the following steps: generating a first measurement signal (MSil) associated with the corresponding sensor using the first signal levels (CPil) measured for the corresponding sensor, and determining a further blindness risk for the corresponding sensor in each case on the basis of at least one evaluation of a plurality of measurement signals (MSi1, MSj1) each associated with another sensor in the sensor group. carrying out a plurality of mutually independent measurements (Mil, Mi2, Mi3, Mi4) for each sensor in the sensor group, during which at least one blindness risk (BRil, BRi2, BRi3, BRi4, BRi5) is respectively determined for the corresponding sensor on the basis of an evaluation of a physical variable of the corresponding sensor or on the basis of an evaluation of ultrasonic signals received by means of the corresponding sensor, and determining a blindness (BLi) and an associated confidence (Ki) of each sensor in the sensor group in each case on the basis of the blindness risks (BRil, BRi2, BRi3, BRi4, BRi5) determined for the corresponding sensor, characterized in that a first measurement of the plurality of measurements (Mil, Mi2, Mi3, Mi4) is carried out for each sensor in the sensor group with the following steps: repeatedly measuring an impedance value (ZWi) of an impedance of the corresponding sensor, and determining a first blindness risk for the corresponding sensor on the basis of an evaluation of its measured impedance values (ZWi), and measuring a first signal level (CPil) of ground clutter signals which are produced as a result of emission of ultrasonic signals- and are received by means of the corresponding sensor, and carrying out a further measurement of the plurality of measurements (Mil, Mi2, Mi3, Mi4) to be carried out for the corresponding sensor using a plurality of the first signal levels (CPil) measured for at least one sensor in the sensor group, wherein the further measurement to be carried out for each sensor in the sensor group comprises the following steps: generating a first measurement signal (MSil) associated with the corresponding sensor using the first signal levels (CPil) measured for the corresponding sensor, and determining a further blindness risk for the corresponding sensor in each case on the basis of at least one evaluation of a plurality of measurement signals (MSi1, MSj1) each associated with another sensor in the sensor group. repeatedly measuring an impedance value (ZWi) of an impedance of the corresponding sensor, and determining a first blindness risk for the corresponding sensor on the basis of an evaluation of its measured impedance values (ZWi), and measuring a first signal level (CPil) of ground clutter signals which are produced as a result of emission of ultrasonic signals- and are received by means of the corresponding sensor, and carrying out a further measurement of the plurality of measurements (Mil, Mi2, Mi3, Mi4) to be carried out for the corresponding sensor using a plurality of the first signal levels (CPil) measured for at least one sensor in the sensor group, wherein the further measurement to be carried out for each sensor in the sensor group comprises the following steps: generating a first measurement signal (MSil) associated with the corresponding sensor using the first signal levels (CPil) measured for the corresponding sensor, and determining a further blindness risk for the corresponding sensor in each case on the basis of at least one evaluation of a plurality of measurement signals (MSi1, MSj1) each associated with another sensor in the sensor group.