I have an 520ia/90 with 60k km. Everything went fine until today when the automatic transmission refuses to
shift to 4th gear. The first three gears go well, but the fourth never engages. I read this bmw uses a ZF TV Cable controlled, ¿what's that? Somebody told me something about an oil filter which needs to be replaced because it lowers the oil pressure in the transmission causing the 4th gear never gets connected.
¿Where can I find more info about my automatic transmission?
Thanks in advance!