Folks,
This sounds ridiculous, but does anyone know what this light really means when it comes on? I have read a few cryptic ideas about sensors going bad or otherwise, but does it just mean that a code has been thrown and it is time to drive to the dealership to hook up to their diagnostic machine to find out what?
I have had this light come on for about a week a month or so ago and now it is back on again. I never took it in (like an idiot) as I wasn't driving the vehicle much at all but I am now concerned, especially because it is back and probably with a vengeance. Any ideas or advice here? Thanks!!

Dubhead