Single Status Update
I had to edit the
(E:\[Games]\DirtRally2.0\)...steamapps\common\DiRT Rally 2.0\input\devices\device_defines.xml
file to get my Controller working again.
Maybe adding or editing the files in
(E:\[Games]\DirtRally2.0\)...steamapps\common\DiRT Rally 2.0\input\actionmaps
can help to. I didn't do it, because I used a exisitng file in there for my virttual Joystick problem.