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Originally Posted by Oriental Life

I continued my search for trunk rattles, as my previous attempt didn't cure it, unfortunately.

But I found that one rattle comes from the underguard (correct me if thats called differently), which holds rear backup light and unused rear fog light. The nature of the sound is exactly what I hear in the cabin very occasionally (at first I thought that I had plastic bottle of water flying in the trunk.

I'll look more there as time permits, but that distinctive sound of plastic hitting the metal can be reproduced if you pull/move/tap that underguard piece, especially from the right side, closer to the exhaust pipe.

Had anyone else noticed that?

Originally Posted by Zadkiel

Rattle coming from some location in the rear. Can't pinpoint it because I'm usually going around 70-80 when it starts.

Originally Posted by SuperDave

yeah mine comes from the rear, but i'm thinking it sounds like the styrofoam that they put the tools in, rubbing against the metal trunk.

Originally Posted by inimitable

At ~5,600 miles I'm just starting to detect a kind of rattling sound that seems to be coming from the rear on the pass. side. I've observed it while traveling on the highway, at highway speeds, and a smooth highway surface. No clue what it is or where precisely it's coming from, nor whether it matters in the slightest, just that I've just recently begun to detect it and, the 2-3x I have, it's mildly annoying.

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Have any of you had success in solving the issue? For a while now I've had a tapping/squeaking noise from the back of the car. I described it once as sounding like plastic bottles rubbing against each other and recently made the connection that it could actually be from styrofoam. Lately I've only heard the tapping. It's quiet enough that you don't notice it with the radio on. It sounds like it's most likely coming from outside the car, so the diffuser, underpanels, rear wheel wells, etc. I just can't pinpoint it myself.