Accepted Answer

Ok, low fluid level would be a cause for the concerns you described above.
The transmission electrical connector sealing sleeve, and plastic transmission pans leak oil commonly on these transmissions.
I would recommend replacing the sleeve, and the whole pan. Since these pans are plastic, they tend to not seal properly even with a new gasket. The pan is about $340, the sleeve about $20, with 4 hours labor, it is a costly repair, but essential if the fluid is leaking.

Once these parts are replaced and the trans is filled with the bmw fluid, it will need to have the adaptations in the transmission computer Reset back to 0. This can only be done with a BMW specifc scan tool.

There is also a bulletin for your vehicle for harsh 2-1 downshifts, this occurs while slowing down almost to a stop then accelerating again, and the trans banging the shift from 2-1. If you are experiencing this, the dealer will be able to program the transmission with a special software retrofit to alleviate this concern.

Expert:	bimmaster
Pos. Feedback:	99.7 %
Accepts:	929
Answered:	11/2/2009

BMW Technician

3 years dealer experience, master bmw tech