The 1995 C-class is fully OBDII compliant. Atleast the 280 is, so I'm assuming the 220 should be also, but I just checked the OBDII webpage and the only 95 Models that were fully OBDII compliant were the S320, C280 and SL320 (interesting... maybe they only had it figured out for the M104 engine? And if so, why not on the E320? Maybe last year of body style... didn't really need it?).
But that means that your car is partially OBDII compliant, so you should get some info, thus your code.
Open your hood (and looke on the underside of the hood) and look at the little plate that tells you about your emissions system, and see if it says OBDII Compliant.. probably won't, but you should get some info that way. Good luck and I hope someone can help you with your codes!
BTW, how did you get this code? Was your check engine light on? Any symptoms or anything?
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)