Actuated car doors with a force-based control are promising to increase the convenience of ingress and egress. They presuppose the determination of the interaction force between user and car door. In this work, for the first time, it is discussed which sensor classes meet the demands arising with this. The measurement of the interaction force is studied by evaluating the performance of strain gages, foil sensors and an acceleration applied to a car door test bed. The results lead to sensor concepts which are reviewed based on technical and financial criteria. Our final recommendation is to use an acceleration sensor combined with a few additional sensors.