Whats is strange I been on the mercedes forums and theres a car same model, same age with same problem perhaps they had faulty batch that year? perhaps merc needs to give me a new one because its their fault
Without seeing it and hearing it, it is hard to be sure, if the air filter is OK and the intake piping is not distorted then there should be a port that you can tap into and run it and monitor the boost, or lack of.
You want to look up your warranty, and if that doesn't help the EPA, site I may be wrong but I always thought anything to do with pollution control has a 7 year warranty.
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