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there are many, many things that can cause a problem in this system. A proper scanner is required to read the fault logs which will point to the failure.
If he cannot find the failure then I would have to suspect he does not have the proper sacnner. you will need to take the car to a shop that has a BMW GT1 or similar scanner.
It is impposible to trouble shoot this suspenson without knowing what faults have been looged so this is your only option at this point.
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 vehicle.
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thank you in advance.