that may be so but i tell you no one's got the real thing like here in Isb, there's Enercon. They connect wires to the engine and sliencer and run the engine as the computer says. then it gives a report. the mechanic then has to fix the problems till the comp says everything is ok. the majority of the delaerships just carry out a CO test and finish off whereas it doesnt really end here. there's much more to it.