A capacitive sensor arrangement (4), for sensing an approaching object (5), is configured as a contact sensor (9) including a plurality of aligned, flat, spaced apart electrodes (4.1 to 4.n). One electrode (4.1) is a main electrode (S) and other electrodes are auxiliary electrodes (H). The evaluation unit (6) monitors the electrodes (4.1 to 4.n) together, such that changes in the capacitances of the plurality of auxiliary electrodes and changes in the capacitance of the main electrode are sensed and compared with one another and/or are compared with prescribed reference values. The evaluation unit (6) plausibility checks the sensed changes (D(S)) in the capacitance of the main electrode (S) on the basis of the sensed changes (D(H)) in the capacitances of the plurality of auxiliary electrodes (H) as to whether or not contacting of the main electrode or an approach towards the main electrode (S) has taken place.