It works like any other start/stop but it appears to use the front sensor when in traffic. It may just be a coincidence but I tested it on my way to work this morning and 9 times out of ten it restarted when the car in front started to move off without me touching anything.
I know the system will restart the car itself under certain conditions and its done that too. It just seems to do it a hell of a lot when the car ahead begins to move.
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I don't have ACC and have noticed my Stop/Start cutting in as I slow down to stop, rather than once I've actually stopped. It's jumping in far more eagerly than my 280's ever did and I don't like it! Sometimes find it cuts in when I really don't want it to and can see this catching out the unwary or unfamiliar driver - tempted to deactivate it with my obd11 but do like the feature when it works properly in heavy traffic so have held off for now....

looks on point though be for the dealers refused it on Seats site

