I'm confused too. Which vehicle were you talking to him about the Paper Clip trick? Yes I've heard of it on early model vehicles but it wont work on the late model vehicles that I'm aware off. Never tried it and I wouldn't either
Yeah the little port under the dash of my 94, I could take a paperclip to, I think (don't hold me to this I sold the truck and don't remember too well), to the 7 and 8 pins, turn the switch on, and the engine light would flash once, pause, two times, pause, and repeat that two more times (this means 12) then there would be a long pause, then any code that would come up it would flash it 3 times. For instance, the egr code, 32, would flash like this: three flashes-pause-2 flashes- then repeat two more times. When all codes were displayed three times, the 12 would flash three more times to let you know that was it. This trick was used so much that parts houses sold a little key that would fit several different trucks along with a book that told you what to do and listed all the codes that would come up.