Originally Posted by
martysmartie
Surely this is only applicable though if you have CAN-BUS, which I doubt the OP'S will due to the age?
Martin
Sorry but the E39 has I-BUS,works mostly the same way as CAN-BUS but only used in E36,38,39.
E39 upto 2001 (pre-facelift) has a round connector in the engine department,99-00 has both OBD port and round connector.
either way use the round connector for diagnose and obd for live data
Cheers