Hey I have this problem too- i noticed the smell and under my "all-weather" matts i noticed a puddle and it smelled really bad.
After a long time I figured out it was only when I went through a car wash that also washed my under carriage.
-While going through the wash i took my floor mats out and noticed the puddle creeping back in. Not sure WHY this happens but something I'll bring up next time I'm at the dealership?
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