Method for functionally testing a pressure-mediumoperated electronic brake system of a vehicle, with a valve and sensor device having at least one control pressure inlet (P42, P43) and at least one control pressure outlet, and composed of a plurality of valves (7, 8, 9, 11) which are embodied as electrically activated inlet valves, outlet valves and redundancy valves or as pressure valves, and with at least one actual pressure sensor for registering and signalling an actual control pressure, and with at least one setpoint pressure sensor which is assigned to the valve and sensor device and has the purpose of registering and signalling a setpoint control pressure, and with an electronic control unit which has a signal-conducting connection to the electrically activated valves (7, 8, 9) and to the pressure sensors (3, 12) for controlling them or registering their signals, wherein the setpoint pressure sensor measures a requested setpoint control pressure which is present at a first control pressure inlet of the valve and sensor device for the purpose of activating a vehicle brake of the vehicle, and sends the measured setpoint control pressure to the electronic control unit as an input signal, wherein the valve and sensor device has a normal operating mode in which the electronic control unit actively regulates the actual control pressure at the control pressure outlet by means of the setpoint control pressure, wherein the valve and sensor device has a redundancy mode in which, when the control unit is passive in terms of circuitry, the actual control pressure which is present at the control pressure outlet is generated directly by the setpoint control pressure which is present at the first control pressure inlet, characterized in that, for the functional testing of the setpoint pressure sensor, the valve and sensor device is in the redundancy mode or is temporarily switched into the redundancy mode in which the actual pressure sensor measures the actual control pressure which is present at the control pressure outlet and signals it to the electronic control unit, in which the electronic control unit subjects the actual control pressure measured in the redundancy mode and the setpoint control pressure signalled to the electronic control unit by the setpoint pressure sensor to comparative plausibility checking, and in which a malfunction of the setpoint pressure sensor is detected, and a fault message is stored or output, on the basis of the plausibility checking, in that the switching of the valve and sensor device into the redundancy mode for the purpose of functionally testing the setpoint pressure sensor occurs when the vehicle is in a specified defined operating state, and in that the switching of the valve and sensor device into the redundancy mode for the purpose of functionally testing the setpoint pressure sensor occurs when the vehicle is in the "vehicle stationary state" operating state or in the "first braking process after starting" operating state. the setpoint pressure sensor measures a requested setpoint control pressure which is present at a first control pressure inlet of the valve and sensor device for the purpose of activating a vehicle brake of the vehicle, and sends the measured setpoint control pressure to the electronic control unit as an input signal, wherein the valve and sensor device has a normal operating mode in which the electronic control unit actively regulates the actual control pressure at the control pressure outlet by means of the setpoint control pressure, wherein the valve and sensor device has a redundancy mode in which, when the control unit is passive in terms of circuitry, the actual control pressure which is present at the control pressure outlet is generated directly by the setpoint control pressure which is present at the first control pressure inlet, characterized in that, for the functional testing of the setpoint pressure sensor, the valve and sensor device is in the redundancy mode or is temporarily switched into the redundancy mode in which the actual pressure sensor measures the actual control pressure which is present at the control pressure outlet and signals it to the electronic control unit, in which the electronic control unit subjects the actual control pressure measured in the redundancy mode and the setpoint control pressure signalled to the electronic control unit by the setpoint pressure sensor to comparative plausibility checking, and in which a malfunction of the setpoint pressure sensor is detected, and a fault message is stored or output, on the basis of the plausibility checking, in that the switching of the valve and sensor device into the redundancy mode for the purpose of functionally testing the setpoint pressure sensor occurs when the vehicle is in a specified defined operating state, and in that the switching of the valve and sensor device into the redundancy mode for the purpose of functionally testing the setpoint pressure sensor occurs when the vehicle is in the "vehicle stationary state" operating state or in the "first braking process after starting" operating state.