Not home - but safe .... why does this sound familiar?

Short version ... van's got a blinking red engine light. Called *my* mechanic and he said "blinking is bad - solid light is ok ... don't drive it". This particular problem is weirdly reminiscent of what happened to me 2 years ago when it was broken down after Pennsic - this time I didn't even get off site though :-(

So, I'm stuck in Slippery Rock, PA - van dropped off at a local mechanic who will hopefully look at it in the morning. I'm in an old motel with free Wi Fi and lovely, little, clean rooms and hot showers.

Cross your fingers for me please..... I want this to be an easy and hopefully inexpensive fix. *sigh*