Locate leaks
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 135i, and 2010 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.
- by spraying water underneath sealing lips
- with ultrasonic leak detector (sourcing reference: BMW Parts Department)
If necessary, seal leakage with appropriate nozzle.