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BMW 640i Questions

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Had windshield replaced in my 640i, went to have camera recalibrated, calibration failed, there was a LVDS communication fault between camera and control unit. Said the camera's housing was damaged. Anyone else have the same issue ?
I see that the 2012 BMW 640i has an aux.water coolant pump for the turbo charger, I assume that is for keeping the turbo bearings cool, so does it continue to circulate the water after you turn off the engine. Also should I be concerned about the condition of the turbo if I purchase this 2012 BMW 6401 with 51,000 miles on it
Thanks
Geoff
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