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      11-09-2012, 08:21 PM   #6
tracer bullet
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Drives: '11 135i - AW w/ TC
Join Date: May 2011
Location: Saint Paul, MN

Posts: 728
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Not sure the %. I am guessing it's just that, a comparison of wherever it is at a given moment compared to the last reset. I doubt it has any idea of an actual pressure, just that there is or isn't a big change.

When winter hits it does go off. Not such a bad thing though, because your pressure is in fact lower and you should fill the tires back up. It's annoying, but it's "right" for lack of a better word.
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