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Common issue on Mercedes-Benz and Mercedes-AMG vehicles, the one way valve that controls vacuum to move the wastegate(s)
Often this valve causes low boost, or irregular/lazy boost, wastegate shudder, and low power
The one way checkvalve works with the oil separator/vacuum pump at the back of the engine to provide clean dry vacuum in order to control the wastegates. This video shows the valve in action, and what it looks like when it fails.
This applies to all Mercedes turbo vehicles, as the turbo(s) wastegate(s) is controlled the same way on all models.
M133 M276 M278 M157 M177 LS1 M177 LS2 M178 M256 M270