A vehicle door element (120, 122) for reversibly closing at least part of a body opening (102) on a vehicle (100) comprises a door leaf (124, 126) and at least one guide arm (128, 130, 132, 134) which includes a door-side portion and a vehicle-side portion, wherein the door-side portion of the guide arm (128, 130, 132, 134) is mounted on the door leaf (124, 126), and the vehicle-side portion of the guide arm (128, 130, 132, 134) includes connecting means (140, 142, 144, 146) which are configured for shiftably connecting the vehicle door element (120, 122) to the vehicle (100). The connecting means (140, 142, 144, 146) comprise at least one first connecting means (140, 142) which is configured for shiftable connection to a first guide rail (150, 152) of a vehicle door
system (110) of the vehicle (100), and at least one second connecting means (144, 146) which is configured for shiftable connection to a second guide rail (154, 156) of the vehicle door
system (110) of the vehicle (100). A sensor device (500) for a vehicle door
system (110) comprises a sensor unit (510), an adjusting device (520), and a
control unit (530) which is configured to control the adjusting device (520) in dependence on the position of at least one vehicle door element (120, 122) of the vehicle door system (110).