The sensors make a clicking noise when they are working. Put your ear up to the bumper and if one doesn't make the noise it is bad or the connection is loose.
2008 E63 M6
- Black Sapphire - Sepang Bronze Full Merino - Carbon Fiber Trim - Alcantera Headliner - SMG - HUD - Soft Close Doors - Comfort Access - Individual Audio w/Sat and HD Radio
2009 E92 335i
- Black Sapphire - Black Dakota - Burl Walnut - Sport - Premium - Cold Weather - Navigation - L7 - Comfort Access - Smoker's Package
Member: BMWCCA #471614