phyberlink

I searched to find anything about my code P0111 and there is nothing! I want to know what is wrong with my 1996 C 280 USA. Is this some type of a sensor ? Where is it located ? what does it look like ? where is a picture of it? and finally, can I replace it? cause I replaced the MAF and the AIR Filter and the Cabin Passenger Carbon Filter. Please help. Thanks in advance