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      02-14-2013, 01:29 AM   #39
MadZarBMR
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Drives: Current: '16 M3 SSII - 6MT
Join Date: Jan 2013
Location: SFBay, CA

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From my experience it seems to fail only when I accidentally touch the sensor. The trick for me is to not touch the car and almost wave your foot in and under the bumper in a rapid but somewhat circular motion. Hasn't failed for me since I figured that out.