Highline Rear Sensors Stuck On

[Hilly81]

This isn't a big issue, but, my reverse sensors are stuck on. They are on all the the time, not just when you select reverse. When I start the car, the initial short beep (usually reserved for when you select reverse) sounds and then the sensors work correctly if anything goes close to the rear of the car. Not really a massive problem as they are silent 99% of the time, just a bit annoying when in traffic and someone get close to the rear of the car and they start beeping.

Any easy things to check/do to try and solve? I'm having a bit of work done by a mate (Hopefully) in the new year so can get it scanned than.

Cheers.