I have a 2003 745i BMW Transmission

Ur BMW X5 series is having a transmission problems and it going to be worst if u don't take this car to a AMGO or the BMW dealership to take a look at it transnission gear box.Must have the car transmission fix.If u adnore this problems long enough the car transmission gears in the box will evenly buckle and grain to a ruin all of the gears parts teeths and than the car have to be in reverse and go to drive again every times tries to drive this car.Evenually all the gears teeths in the transmission box are all gone this car will go into iddle and will not go into drive gear at all.

You should have the control module checked by a tech as either their is too much slippage or it is interfering with the anti-lock system.

Have an OBII scan done. (fault scan) Your description can describe many things and a scan will narrow it down to the exact faults. It's easier & cheaper than throwing parts at it. Trust me, I used to work for BMW NA

Transmission is slipping. Take it to a shop right away.

filter and fluid. If that doesn't do it $4000 should do it.

to check oil start vehicle in park and let idle, open large allen bolt [normally 17mm] on g/box sump, oil should spill from aperture. if not top up until it does. this must be done at a temperature of less than 30 degrees celsius as oil expands at higher temperatures.

It definitely sounds like the transmission. If you haven't had the transmission fluid and filter changed I would recommend having that done. I also recommend the Lucas transmission oil which will help alleviate (within reason) slipping issues.

thottle positioning sensor? if trans has overdrive could be a lock up piece, dont remember name of it. there is a lucas oil product that might help. if it is the overdrive.

http://www.e38.org/1997Manual-7Series.pdf

Page 63. It seems as though you have your transmission in Manual Program. Normal driving should use Adaptive program.

Or, your transmission is slipping.

you should go to a transmission guy they have computers that will find the problem and i think that its free... but i think that your transmission needs to be rebuilt, theres a lot that can go wrong with them things