Hello I have recently bought 2007 x type estate and the sensors (front and rear) have never worked. The red light above rear view mirror justed flashed when reversing ect. I then checked each sensor for the ticking sound and found 1 not to be working. I replaced this sensor and its now working but still red light falshing and still no sound. Could it be the module in the boot ? Fuse(s) ? I am stuck now and not wanting to spend money on a module if there is anything else it could be. Any help will be great , thanks for your time Bobbybailey