The first number you gave doesn't come up and the group ID 049 wouldn't exist.
The second part you gave is the additional air valve for your car and has a MB list of $125. It is a thermostatically closed air slide. It fits into the block beneath the intake and gives extra air when cold similar to a fast idle on a carburated car with a choke. Its only function is that of a throttle. It is not responsible for mixture control and can't cause an engine to run badly just at the wrong speed (unless it is some kind of airleak (which would be more of a hose problem).
The most common failure of aux air valves is to not close and result in too high of an idle.
Bosch Master, ASE Master, L1
33 years MB technician