Vf7 = France, Citroen.
Y3 is Xm, Series-1 body.
AC = Xu10, 2.0 injection, 8 valve engine with manual gearbox, saloon.
0006 = the sixth series run of the AC type.
AC again...Engine/ body type
8441 = Unique serial number of that car.
1845 = Gross vehicle weight
3145 = Gross train weight
1 - 1020 = Max front axle load
2 - 825 = Max rear axle load.
Most of the information you will need for your car can be found in the Citroen Private Car Books, found in the Self Help Files section of the forum.
viewtopic.php?f=13&t=11023
Specific engine technical information can be found in the Engine Management Technical information thread, also in the Self Help Files section of the forum. viewtopic.php?f=13&t=10588