Does your car have passenger airbag? If so the most common problem in euro cars are the weight sensors inside the passenger seat. These sensors recognize if there is someone in the passenger seat. Another problem is the airbag conection on the steering weel. This part gets tired with high mileage.
Is your battery full charged?? If there is a low voltage in the airbag connections the light comes on. The right thing to do in these cases is to check in a bmw dealer with the bmw diagnosis.
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