you might have to put in a special code into the radios head unit. it generally comes with the car manual. that could be all it is..when the battery is disconnected that's what you should do...
cable
on the registration document... probably starts "WOL............."
size 619
Towards the windscreen end of the fusebox under a plastic cover within the fuse box
use the key
Try the related link below.
The head gasket has blown and needs to be replaced.
Coil pack needs to be replaced
half inch socket on extension,screw on left hand side of battery tray
The battery is a CR2032, Vauxhall part number 90541381.
engine bay on the left in front of the battery
go on comma oil web page and put in your registration and it will forward you to all lubricants and spec.