Q7 Parking sensors
 

Hi Guys, wondering if anyone can help, my 2006 Q7 parking sensors have stopped working and now just beep when in reverse without showing the parking sensor screen. My wife said when it went off it showed the rear left sensor faulty, sure enough when I touched them all, when car in reverse, that was the only one that didn't 'click' which I have been told is the sign of it not working.
I have replaced it so now it does 'click' but what I have now is the parking screen coming on but a continuous long beep and the screen showing that its picking an object up to the rear when nothing there!!, wondering if it needs re-setting or something similar????, thanks for your time guys.