OBD Connector Issue

[mkb]

Ok Folks,

First issue for me on the 99 A6 28q Avant.  Took it for an emissions test but the emissions guy was unable to get the analyzer to communicate with the OBD.  He suggested I take it to another station and try someone who is running a different analyzer.  So I did that and the tech there said that he sees a comm channel open between the analyzer and the car but nothing else.  Can't get a reading though.  I have access to a friends VAG-COM which I'll try hooking up tomorrow but was wondering if anyone had encountered such an issue before.

Any BTDT out there?

thanks

--
mohammed
99 A6 2.8q Avant
97 A4 18tqa