TCS is the triangle with the ! in the center (Traction Control system) A STARR computer is the system Mercedes uses to program the multiple computers and options on your car. It is linked to the mainframe in Germany where everything is stored at Mercedes.
Your car has the coils mounted on the end of the spark plugs so there are no wires, just the COP (coil over plugs) for each cylinder.
The smart OBDII codes are listed on the Evilution website which is the encyclopedia of everything smart including the European models we don't get in the USA. it is a pay site (you pay to subscribe) but it has tons of information and pictures for everything!
and parts can be ordered here