BMW Questions? Ask a BMW Repair Expert for Answers.
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Your model here uses an electro-hydraulic steering system meaning it is half electronic and half hydraulic.I dont suspect this is a fluid loss issue here as usually you would still have the issue on start up again and since the fault went away when you restarted it this sounds like a component with the electronic part of the system is at fault needing replaced.
What has to be done from here is to have the fault codes checked/read out using a scan tool that can plug in and communicate with all computers in your model here.Once this has been done any codes set need to be diagnosed to locate and correct this issue.I suspect a sensor at fault or the electronic control unit possibly acting up needing replaced.This will have to be checked into and tested further to pinpoint and repair the fault here.
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