2013 C63 sedan rear bumper sensor loose
But i'm sure with the rear of the car lifted you can try to snap it on. The sensor actually clips onto some type of plastic piece by the 2 edges on its side (see pictures). So all you need to do is pushing the sensor in. The tail (where the wiring harness connects) of the sensor has to be horizontal.
GL
http://www.super-nation.com/Picture/...04A-AMG/11.jpg


