MB publishes a code book that is half an inch thick and applies to models up to 1994. After that some models need a complete book just for themselves.
The codes you have suggest to me that you probably have a bad throttle assy. The first, #2 is for a bad ECU, #5 is for a stop light switch, and #11 is fuel safety shut-off closed throttle position error. The bad ECU code happens when too many things are implausible, usually not the control unit.
Erase the codes and see if they come back. If you have no further symptoms don't worry too much about accumulating codes over time.
Bosch Master, ASE Master, L1
33 years MB technician