Join Date: Jul 2015
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I'll bet I'd change the rear floor carpet. at least pull the rear seat bottom, To see if something was under there.
Like you said it wasn't there until rear hump carpet was changed.
Have been fighting a nasty odor that seems to be coming from the trunk in our 2015 K900. Dealer has cleaned out the a/c duct, replaced some of the carpet and it solved the problem for a short time. Came back after I washed the car by hand on the driveway. Seems to be coming from the trunk.