Air bag sensor light illuminated for passenger side

It's a poor sign if BMW can't figure out the source of the problem bu obviously their is a fault that would need to be diagnosed to have the airbags (SRS) to operate properly. If there is any independent BMW specialist in your area you trust ask them if they have seen a common problem with the SRS system or felt confident diagnosing problems in the SRS system. There is a professional service called Identafix. http://www.identifix.com/info/about_us.htm They only deal with professional repair shops. They are in the Minnesota 651-633-8007. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base.