do you have the last 7 digits of the vin handy?
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there are MANY different things that can cause these warning lights on this vehicle, and unfortunately it is not feasible or practical to chase this down without having the fault codes read from the vehicle.
This could be a simple bad wheel speed sensor (any of the 4), but could be any of the other sensors that the system uses to inform itself, or even an internal failure of the control module in the car. Again, you will not be able to determine the cause without reading the fault memory, the first step in diagnosing these lights is always a fault scan.
At this time, you will need to have the fault memory read from the car using a compatible scan tool. The fault codes stored in the car will point you to the failed component. Without the faults, this will become a very expensive guessing game.
Also, on this model when you change the brake fluid, the system needs to be bled using BMW diagnostic equipment because there is an ABS pump in the system, so this could also be playing into your problem.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
It has been my pleasure to help today and I wish you the best of luck with your purchase.
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thank you in advance.