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data from the OBD-II connector does have to be "requested" from the ECU (i know this as a programmer....a few bits are sent, and then a few response bits are returned)....but overall it does sound like from these replies that it should be fine to leave it permanantly connected and running. i agree that it would not make sense to have the engine go in to a different mode when you are trying to diagnose information about what it is doing. anyways, thanks for the help, i believe my question has been answered now.
-blake
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