Hello, I have a surren/fiepen/pipes in the speed range between 1500-3000( or higher) revolutions/min, always short 1-3 sec, only while driving. My engine is a D4204T23 with 173kw, 235hp, 2l, biturbocharger with VTG. The whole surely already 10 months, rather 12 months, has 120Tkm on the speedometer. Question, there are also other possibilities than replacement?! Each workshop wants to replace the turbo and requires between 2,500€ and 7,500€. Possibility of repair I have read, but with everyone I have requested the same answer, currently no parts available or locked by Volvo. Also I have read here in the forum that it sometimes helps to tighten the screws. Does anyone have a guide where the screws are?! Also a turbo expert told me today that he can not imagine that the turbo can be defective on the model. The periphery has been recently tested, everything is all right. Can someone help me? I live in Munich.