How many o/o carry diagnostic devices
How do you know what is wrong? Could be simple? Could be cleared and limp home? Dealer is going to be honest? Right. You brain surgeons running deletes that can't go to dealer? What do you do? I would never leave home without diagnosis equipment or proper tools, even for my older trucks. I'm not selling something, but trying to understand the logic.
If you own 1-5 trks and can't repair a light correctly how do you survive? No diagnostic on board, and I mean real diagnostic computer?
I'm not selling anything just trying to understand.