I have a 1997 528i and the trany randomly shift down and stays there, we can move the shifter around from drive to s3and so on but it seems to have a mind of its own. It seems to happen when its rainy out. I have changed the trany filter and fluid but it still does this on random occasions. I am thinking it could be the position switch on the side of the trany, does this sound like a good place to start?
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Pelican Technical Article: BMW Automatic Transmission Fluid Change