I know not many of you guys remember when TVs first came out. But they hadn't started using transistors at that time and the vacuum tubes were highly unreliable and when your tv started rolling all the time (Horizontal) or went all crookedy(vertical) or a miriad of other problems happened you had to get a shoebox and dismantle your tv and remove all the tubes and take them to the drugstore where they had a tube tester and plug each one of them into the machine to find out which tube was bad and then you could buy a replacement tube. You kind of had to hope it was a $1.19 tube and not a $3.49 tube cause $4.00 was half a days wages in texas at that time. I said all that just to ask if there is a way to test Im. Control sensors for the highly unreliable systems on todays cars or is that still GM GOTTCHA?