A different PDC problem?

Hi everyone, I’ve had troubles with the pdc on my car since I bought it. Used to be a long beep when engaging reverse and then after that it would be a regular beep, one every second or so.
Replaced all four of the sensors this morning, and engaged reverse, no long beep! Thought I had it sorted, just a regular beep every second.
However no matter what I try, I can’t get them to pick up any obstacles, I can hear them clicking but nothing changes no matter what I try.

Sorry for the long post, couldn’t see any posts with the same symptoms as mine.

Cheers!
 
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