Mercedes ML Hybrid Boost Pressure Issue

I understand you are experiencing a boost pressure issue with your Mercedes ML hybrid The symptoms you describe indicate a problem within the turbo system I encountered a similar situation with my previous vehicle, a Vauxhall Insignia, with a petrol engine The symptoms were largely the same reduced power check engine light and unusual noises Have you checked for any error codes using an OBDII scanner Have you inspected the vacuum lines associated with the turbocharger and wastegate for any signs of leaks or damage It would be prudent to ensure the integrity of these components before replacing the boost pressure actuator valve

Thanks for the reply Yes I did pull the codes it's specifically pointing to a boost pressure control malfunction which is why I'm focusing on the actuator valve I did a quick visual check of the vacuum lines didn't see anything obvious but I'll give them a more thorough inspection When you had the issue with your Vauxhall Insignia was the error code specific to the actuator as well or was it more generic And did you end up replacing the entire turbo or just the valve itself

In my case the error code was fairly generic indicating a 'turbocharger underboost' condition Upon closer inspection it was determined that the actuator rod connecting the wastegate to the actuator was seized preventing proper boost control I did not replace the entire turbocharger assembly instead I opted to replace the actuator valve which resolved the issue Given that your error code is more specific directly implicating the boost pressure actuator it appears that replacing the valve is a reasonable course of action However considering the complexity of modern engine management systems I would recommend consulting a qualified technician to confirm the diagnosis and ensure proper calibration of the new actuator valve after installation

I took your advice and had a technician take a look Turns out it was indeed the boost pressure actuator valve just as suspected I replaced it recalibrated the system and everything's running smoothly now Total cost was around 250€ Thanks for confirming my suspicions and sharing your experience