Here's an odd one, 3T Greenline Superb 2011 manual gearbox with rear OPS reversing sensors.

 

Have noticed a weird single beep 1-2 seconds every 2-3 minutes when driving coming from the rear area of the car. It's not the reversing sensors but not a dissimilar tone.

 

I have turned off the radio and Bluetooth to my phone just in case and it was still there and even there when I turned the engine off and stopped.

 

Anyone had a similar thing at all? If it was coming from something in the car that wasn't car related it would be like something telling me that battery was flat on something battery powered. I am stumped, no error lights on the dash board, nothing appearing on the MFD, just me in the car.

 

Anyone had this? There is a tow hitch fitted to the car but the electrics are all good and in good condition. The beep doesn't coincide with anything operational in the car, it was doing the beep on the motorway and when stopped parked.

Is there a backup battery in the alarm siren or something like the Audi's ? (https://www.audi-sport.net/xf/threads/audi-a4-b6-alarm-siren-replace-nimh-batteries.90361/)

 

Found that thread above and it sounds awfully familiar!