Sorry, it's a 2001 156 Sportwagon 2.0 Veloce Selespeed.
There is a button on the dashboard, that according to the manual, you press briefly to display the outside temp and hold for a few seconds to reset the trip.
Resetting the trip works fine, but the outside temp does not.
Again, according to the manual that function is only available on cars with Climate Control - which I assume mine has
