This recently happened to me as well, except my SRS light came on and hasn't turned off.

I have a 2003 CLK500, which hasn't been in an accident (knock on wood) and my SRS light came on the other day - it happened right after I filled up gas (I dunno if that matters at all). The battery was replaced in Oct-2007, so I don't think it could be the battery. You think it's likely the OVP or should I just take it to the shop to have them look at it? Would something like this be covered under the extended warranty?