So I have a 2011 x coupe and I've recently started to notice that sometimes, doesn't happen all the time but when I'm stopped at a red light or car just on and I'm just stopped for a min or so I feel this "shake", little "rumble" or slight vibration. There is no weird noise just that subtle shake. I feel it last for a couple seconds and goes away. No weird shake during driving just while stopped. And let me just say its nothing u can really see. It's not as if you were to see my car shake if you were outside the car. Just a weird little vibration. I've only recently felt it like last month or so, so I know i wasn't a pre-existing thing from when I bought it last year and just never noticed. Thanks for ur help guys. And ideas before I take it to the dealership? Should I be concerned?

 

If it's under warranty just go to the dealership with it. Do you have any mods installed?