Might be worthwhile checking the wiring loom if it goes close to the battery shelf on the 1.9. I have a 2.4 (not the same as you I know), and a couple of years ago I got an error message pop up as I was driving just before I got to a roundabout. When I pulled away from there, the turbo wasn't working (would have been quicker to push the car without it!) and then a sequence of messages virtually the same as yours. AA traced the fault to the battery shelf abrading the loom and shorting a cable(s) which controlled all these. (Mind you, it also blew one of my fuses....)
A length of electrician's tape (& a new fuse) and all was well.
Alfa History: 145 1.7, GTV2.0, GTV 3.0 V6, Brera 2.4 JTDm