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The 1er/3er/X3 do not have sensors on the rear doors, hence why it's only $500 (or something like that) versus $1000 for the 5er and X5 which have it on all 4 door handles. It's not cost-cutting, rather the X3 isn't quite the 'luxury' SUV of the X5. It's the same reason you don't see the Lane Departure Warning or Blind Spot Assist like what's available on a 5er.
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