Ubeed

Hi guys, I’ve got an Audi a3 8v 2015 s line automatic with front and rear parking sensors. Since June they’ve stopped working, I’m getting a fault code of B107A14 supply voltage for park assist sensor: open circuit/short circuit to ground, I’ve tested both looms and visually looked to see if there was anything wrong and they seem fine. So the next step I was going to check and look to see if I can fix the sensors would be to check the module, I’ve read online that the module is located in the rear boot but I can’t seem to find it in my car, Would Audi have placed the module anywhere else for a vehicle with both front and rear sensors ? And if so where used modules are going online for £15-25 so I was hoping if I swap the module it may solve all my problems since the wiring seems ok.