Not to add to the confusion, but I have some thoughts on the matter.
I have the same problem, and I took it to an alfa workshop to get it diagnosed yesterday.
The error code for cam sensor came up and did not go away when they wiped the error messages.
My boggel with this diagnosis is twofold.
1: the cam sensor is supposed to be sturdy as hell and shouldn't break, unless someone's been rough handed when changing the belts, which was done ages ago. This doesn't mean it can't break, it just limits the likelyhood.
2: the trip meter zeroes out every time I get this problem. The battery is just fine and charges at 14V (I had it checked at the same time as the diagnosis) and so is the dynamo. The trip meter leads me to think (someone please correct me if I assume too much now) that maybe the wiring between battery and somewhere else are getting soddy, cutting off power.
Headlights are bright as the sun though, not yellow and dim like you would expect from a bad charge or bad battery.
I got an appointment the 6th to get the cam sensor replaced. It's expensive. If the problem persists, I will be most annoyed, but checking the wiring is the next point on my to-do list.
I'm no expert, I might add. I was actually hoping they'd say this was a common issue when I took the car in for a diagnosis and that they would tell me exactly what it was, but the blank look on their faces suggested they had no idea what was the cause. I'm just hoping I'm not throwing away money on this when the answer could be in faulty wiring.
I wish I had a multimeter and some knowledge of electrics so I could check it myself.
Last edited by paperboy; 23-11-13 at 07:00.