At the top of this page, one of the tabs is for "
ePER". Enter your VIN number and it will tell you the engine type. If the
ePER is not working, put "fiat
eper" into google and you'll find one somewhere that is.
I'm not sure but I think the 105 is a CF2, the 110 (mine) is a CF3, and the 115 is a CF4.
hth
Neil