Strangly enough, I bought my X5 40i from a dealer near Irvine (similar to OP's location) and have the same issue. It is a loaner lease. I'm not sure if this could be due to defect or loaner abuse (no break-in period).
Just to be more descriptive, my problem of this "rattle" noise happens when:
1. when I maneuver the vehicle left or right during parking
2. accelerate a little and decelerate (engine brake engages)
May be I should visit the dealership whenever I get a chance.
If anyone has an update please let us know!
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