A light came on in my 2006 volkswagon passat 2.0t and it went off again (it looks like a picture of an engine or something similiar) and then just today it came back on. The first time the light came on was about a month okay (Thanksgiving) when we were driving from North Carolina to Ohio, we were in the mountains when the light came on, now this time on the way to Ohio again from N.C. the light came on AGAIN in the mountains, I'm wondering if it's related to the dramatic weather change. (In N.C it was about 55/60 and then in the mountains/ohio its about 25/30.)
Any suggestions?

Thank you!