Learn from my mistake
If your B11 (plus the other CARC bikes I would think) starts to give you random "insert code" messages do not think it's just a random MG message
Mine did it and then decided to refuse to start without a code in the fuel station a couple of miles from home and I could remember it so had to be dragged home on the trailer.
The cause of the problem was the female spade connector below had snapped off the strip of metal that makes a tight contact with the male half

Once I had the replacement it took 10 mins to fix
But the moral of the story is, make sure you know the used code so you don't get stranded :thumb:the
Tris
PS I read on an Aprilia forum that the antenna has a resistance of 14.3 Ohms. Mine read exactly that so a good way to eliminate the coil and look for other connectivity issues