So my car is healthy again.
I had a faulty sensor (Jenn you were right!) that made it appear than my cam-shaft was locking up. So my car went into self preservation mode and wouldn't start.
The sensor repair was under warranty. Thank you Hyundai. So was the tow. Thank you Ray, although you took your own sweet time showing up.
But, once the car was at the mechanic, I needed to have my 30K service done and they advised that my front tires (which I did not rotate regularly enough) were dangerously bald. Sort of like me.
So I spent a lot of money yesterday. But the upside is that my Santa Fe (she still needs a nickname BTW) is purring perfectly like a cat. She almost drove herself home.