The past few drives, I've noticed a rattle noise that I cannot pinpoint. The sound varies in severity with it being very noticeable at WOT and faint at cruising speeds. It's gotten worse. The sound is reminiscent of like a cellphone vibrating on a hard surface. It's kind of clicking/rattling. The sound is coming from the left of the steering wheel. It doesn't appear to be coming from the engine bay. It sounds more in the dash region like deep in the air vent in that area. Unfortunately I can't be more descriptive because I cannot pinpoint the exact area. It's deep in there. Sounds like something needs to be tightened up. All I know is that it didn't do this before and it's getting progressively worse. I'm going in for a scheduled maintenance soon and I'll ask then, but I didn't know if anyone had advice. It's getting to point where at cruising speed it's faint enough to be ANNOYING. Any advice??