The 1994-1995 C Class has OBDII, but is not fully compliant. The connector is located under the dash near the gas pedal. I'm not sure what the limitation of the OBDII on these cars. It wasn't until 1996 that cars needed (fully compliant) OBDII by law. Maybe the C class was the first to get OBDII in the MBZ family?

-Chandra