2000 X5 ODB port not working

[ronlee00]

Hello,

We have a rarely used 2000 x5 that is due for a smog check. The first shop couldn't get any data from the square ODB port under the dashboard and recommended that I drive 100 miles and come back so I did, but he still couldn't read it. He then recommended I tried another smog check nearby so I did, but the 2nd shop couldn't read it either with either of 2 his machines.

I didn't get any hit on this site or others on googles. I did check the fuses for On-board computer (#7), On-board Diagnose II (#14, #51), On-board monitor (#7), Cigarette lighter (#25) and they're all good.

Has anyone come across before? Thanks in advance.