For the past month, my 2005 q45 has a loud rattle that seems to be coming from the rear passenger side that is driving me crazy. If you're in the car and looking towards the direction of the rear windshield, it sounds like its coming from the very back left side, behind the seat and to the left of the amp and sub. Its not a speaker problem, and I can't figure out what it is.
The only thing I can imagine it would be coming from is the fuel tank door or something to do with the fuel grommet filler neck (the black plastic piece underneath the fuel cap. All screws are tightened, but I noticed that it doesn't take much force to move the grommet filler neck side to side, resulting in a "clanking noise".
is it supposed to move around like that, or should it be rock solid in place? Has anyone else had anything like this?