most people use some electronic diagnostic equipment that tells them everything if their used to OBD fault codes and CANBUS systems. People like that I like to just class as "fitters". ha ha adam thats spot on cracked me right up , its true modern day mechanics dont know how to fix without diagnostics tools if the computer didnt tel them there clue less would love to see them mess with the old carbs and points setups ha ha most cant even set up a carb without help