The D1 has an OBD-2 port to the right of the steering column (as viewed from the driver's seat) just below the kick panel. Any decent code reader should be able to talk to it. Stick your head in the footwell and take a peek. It's not visible from the driving position but it's not exactly concealed once you're at foot level.
Its a little, black square box that has a red display for the numbers. Sometimes it's zip tied up on the seat rail but as Jimmy said, best to stick your head down by the back seat, passengers footwell to read it.
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