Read the VDC warning section 5 in the manual, it appears to be a fairly touchy system that could be affected by several factors causing the indicator to illuminate including rough or banked road surfaces and then things like pads, rotors, suspension, tire, wheels and engine mods that aren't to spec. None of these apply to my car but I can predict the dealer won't bother with it unless the light stays on all the time at every startup.
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2011 Touring/Sport/6mt | winter: 2009 WRX
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