Originally Posted by crystalline

The way I understood it, and maybe you can clarify, was that MA knows which ids are allowed for the car. IE if you had 1VZ2D, 1VZ2C, 1VZ2B, 1VZ2A from your list and you were a 2012 G37 you were ok and would pass. However, I was told if its an unsupported/unknown ID like a euro tune, something not normally associated with the car, it would trigger a failure. Could you clarify at all? It would just be strange that having the ECU repaired/updated at the dealer or a shop on any make/model of car could trigger a trip to MAC. Obviously some of us have something to hide (IE removed emissions equipment) but 99% of the people that auto failure would catch would be stock.