the rear sensors do not work
I changed them still not working
I can't find where the parktronics module is mounted. I was looking under the steering wheel .. on the left in the trunk under the upholstery it is also missing

 

I see your country code is in Bulgaria. U.S.models are different.

Later U.S. models have the parking/back-up control unit located in the passenger side, up above the side kick panel.