Car: 1994 Mercedes C220
Check Engine Code: 1700

I was getting a check engine light and took it to a mechanic friend (certified BMW, but does do MBZ) of mine...He used his SnapOn to pull out a code, which is MBZ proprietary...Can any one tell me what a 1700 code means?
I thought OBDII meant the end of mfg. specific codes!

Thanks,
Chandra