BMW had diagnostic ports long before Obd and OBD II ports in modern cars. The port is under the hood. It is approx 3 " round connection with a screw-on top. It is a 24 pin connector. You will have to look on line to get the reader or an adapter for the OBD standard port.
SORRY, FOR 1993 BMW, THERE IS NO PLUG FOR DIAGNOSTIC TOOL,
or you can ask the 24 hrs live technical support http://www.diyobd2.fr/ they will like to help you, good luck
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