Check Engine Light on Highlander

I just wanted to thank everyone on this site. I had my oil changed along with the air filter on Monday. As I was driving home, my Check Engine Light came on. I took it back to the dealer and said that it was probably the air hose. It was exactly that and they fixed it right there. If I hadn't read about this being a common problem with changing the air filter, whose to say they would have been honest about the problem?

Thanks again!

Keith