I am the proud owner of an euro spec 316I with some serious transmission problems. Looking for help if any one has any ideas. I have changed the fluid and filter fuild more than once, when i am driving it goes fine until it warms up then the transmissson will not shift correctly into higher gears unless you release the gas and then press it again. My buddies tell me it is a sensor in the transmission. The delear says there is only one sensor on the top of the transmission under the shifter. Lost for words can anybody help?