If anyone else is experiencing this, this may help you out. I had an annoying rattle coming coming from the trunk/rear spoiler area at idle. You could see the outboard end of the spoiler vibrating up & down & the noise stopped if you held it. Look underneath on the bottom side of the spoiler. There are some round plastic plugs. Pop them out with your fingernail. Inside is a small black phillips head screw. My outboard two were loose. Tightened them up & rattle was no more. If it happens again I will loctite them. Be careful putting the plugs back in. The flat faces front of car, the horizontal prong faces left, and the vertical one goes to the right (if viewed from rear which is the only way you would do this anyhow). Yes, I looked in the FAQ under what's that noise & this wasn't there so I thought I would post it.