I have had my car scanned with VCDS and get these faults

2 Faults Found:

01134 - Alarm Horn (H12)

000 - -

00941 - Exterior Mirror Retract Motor; Driver Side (V121)

012 - Electrical Fault in Circuit - Intermittent


Not too bothered about the mirror as it seems to function properly but I would like to replace the alarm horn as I have heard if the battery goes flat in the alarm horn it can cause main battery drain.

Does anybody know where the sounder is located on a 2012 Bentley Continental Flying Spur?

I have read about people replacing the onboard battery in the sounder but you have to solder it, does anybody have any insight on replacing the battery?

 

It moved from under the front scuttle to behind the left rear wheel arch liner at some point. I know by 2015 it's behind the wheel liner, but I don't know the exact date it moved.

Yes, you can solder a new battery in, but at 14 years I'd say it's highly likely that it has already leaked and damaged the circuit board.