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Re:Europe Wants a ‘Right to Repair’ Smartphones and Gadgets by Too on Saturday March 14, 2020 @03:29AM (#22573771)
This already exists, OBD2 is a standard diagnostics interface mandated by law. I would guess most of the tools you are referring to are using this.
Re:Europe Wants a ‘Right to Repair’ Smartphones and Gadgets by justinclift on Sunday March 15, 2020 @09:33PM (#22588774)
Yeah, but AKAIK the codes themselves seem to often be manufacturer internal info.

People into automotive (and boat, uav) CAN stuff have figured out ways to reverse engineer much of it though.