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      03-25-2008, 02:21 PM   #3
MINNOW
Current E90 Fetishist
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Drives: '07 323i / '04 MINI Cooper
Join Date: Apr 2006
Location: Edmonton, Alberta

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Old system is indirect, using ABS system to detect speed differentials among the 4 wheels/tires.
New system is direct, with individual sensors on each wheel that sends a reading to the OBC.
Advantage of the new system, it tells you which tire is low pressure.
Old system advantage, no need for expensive sensors. (for example for a second set of wheels/tires) It also seems to be fairly accurate.