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In my car (BMW E46 323I 1998) I have both connectors, that is, the 20-pin OBD1 and the OBD2, what is the difference between the two, I am referring rather to the functionality in my car, that is .

OBD1: enter image description here

OBD2: enter image description here

With one I can somehow access the switchboard in a "deeper" way to the switchboard? Or certain information will only be given to me from one of the two? Also say that I have the 20-pin OBD1 on the hood, while I have the 16-pin inside the car, under the steering wheel.

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    Here in the States almost every car 1996 and newer utilizes only the OBDII connector. I know vehicles sold in Europe didn't necessarily go completely over to OBDII until a little later (I don't remember off the top of my head when). Some cars had it; others didn't. I can suppose some had both? OBDII will give you a huge amount more data than would OBDI. If OBDII is available, use it ... you can't go wrong. I don't think this answers your question, so leaving it as a comment. Commented Nov 7, 2022 at 22:32
  • I would suggest to ask this question on a BMW owners group forum or facebook group, surely they can answer it for you Commented Nov 13, 2022 at 4:05
  • With OBD-2 you can read only engine errors, as I know, but if you connect under the hood, you can read all car and program it with INPA
    – Green176
    Commented Mar 9, 2023 at 5:16

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