Check wastegate valve with vacuum
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2014 BMW X6, 2013 BMW X6, 2012 BMW X6, 2011 BMW X6, and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.
Wastegate valves must be opened without vacuum.
The wastegate valves must close if a vacuum pressure is applied at the wastegate sockets (see BMW diagnosis system).
Check shaft on turbine wheel for rotatability.
Follow diagnosis instructions.