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.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician