It's a light many drivers fear they'll see turn on at the most inopportune time.  It's the one on the dash that says "Check Engine," "Service Engine Soon," or it may be simply an engine-shaped li...

You've probably had your Check Engine Light go on.  Then it goes off and you figure, hey, whatever the problem was, it's gone now and I don't have to worry about it.  Well, the problem may h...