BMW Questions? Ask a BMW Repair Expert for Answers.
The Bit Serial Data BSD . can be cause by the alternator or oil level sensor
DMW spwcific software would be needed to see if you have the Toems Fault
As well as BSD , YOu can also have the IBS bringing down the BSD line.Check for water in the trunk ,at the Battery and in the spare tire well .
An aftermarket alternator of the wrong type can overcharge the system and cause irregular shifts .
The Mixture Prep I would smoke the induction for intake leaks
and check if the MUltplicative Adaptatiojn is out of range
Some scanners will not pick that up
Enssure that the alternator is not overcharging first.