I have a mate who is an auto electrician and for many years he worked out of a ute doing mobile work mostly at car yards doing whatever was needed and often he would get stuck with a problem needing some code or something that the manufacturer or selected dealers had access to. He was able to get cheat sheets of codes from the internet but it always made solving the problems much harder. He has recently given up on the mobile work, gone back to working in a shop and leaving his boss to sort out how to get the info the manufacturers make so hard to get
