it a srt6 or limited,, all TCU"s interchange but only limited to limited or srt6 to srt6 in case u need one from junk yard.
also have u disconnected the battery for about 1 min, and pump the brake peddle to discharge the system. then reconnect the batt.
the computer the mechanic has has to ask for a 2002 slk 32 (if your car is a srt6 or a c320 / slk320 for the limited.