Hi there, I have the problem since yesterday that I have a louder squeaking on the engine. My first thought was that the noise comes from the belt drive, which is too shrill for this. Now I have found that a vacuum is forming in the crankcase. As soon as I pull off the hose on the oil separator the noise is gone. The MIL was also addressed yesterday, however I could not yet read out the error memory. I had not given that at first too much meaning, because I suspected the noise on the mechanical side Does anyone have an idea how the underpressure could arise? Normally there is rather an overpressure in the crankcase Many thanks for the support Matthias