Originally Posted by FC3Cturbo
s5 have maf sensors, they do not have the flap-door afms. One is probably just an early year then the other, either or they are the same thing and they make no difference at all.
It prob goes by Quarters of the year. as in the A is the first Quarter of the year January through June. and the B is for the second Quarter of the year July through December. Whoever bought one from Jan-june got an A and whoever bought one from July through December prob got a B. Dunno just making a wild guess.
- CoRDiTe