Moin, since yesterday my engine control light shines. Since I had checked this several times the usual suspects. Well the strange thing: the car drives normally, maybe even a tick better than before – the solenoid valve for the turbocharger hums like a vibrator at maximum speeds – if you turn off the plug of the solenoid valve as well as the hoses nothing happens. The car runs without problems and the lamp even goes out.!!! -(magnet valve) A hose has a quite strong vacuum, with the other hose is nothing. no overpressure, negative pressure etc. What could that be? One day before the mill ran without any problems. possible marten bite? Presumably some germinate AGR or vacuum pump has a way? MFG