I have a 2000 328i which I bought a year ago May.
The only problem I had was with the drivers door
power window regulator. The cables were making
snapping noises. It was changed under warranty.
The previous owner had to change a couple of
sensors but thats it. All new cars have tons of
electronic sensors, gagets etc. which are not made
by the actual car company. All car companies buy
in all these computer chips, sensors and rely on
them working properly.