I'm a Doctor, Jim, Not a Mechanic...(Star Trek circa 1960 something)

So there I am just toolin along down the road singing a song and having a good day and the dreaded Check Engine Light comes on...AGAIN.  I just had this POC car in the shop the other day when the same Check Engine Light came on and when they hooked it up to whatever it is they hook it up to all the sensors came on.  Mike the Mechanic said, "Linda, sometimes this happens and it's probably a fluke so I reset the light.  Drive it around for a few days and if it comes back on call me. No charge."   Me:  "Okey dokey".  Today POC car goes back to Rodney the Wundermechanic and yes, there IS a problem.  In fact there are a series of problems. Uber charge.   But it's drivable short-term (read:  until tomorrow when he has parts).  I know how to fix this:  I'm just going to stop looking at the stoopid dashboard.  Oh crap on a crutch!