Mercedes A Klasse Hybrid Turbo Issues

My 2019 Mercedes A Klasse hybrid is playing up. Got 190169 km on the clock. Check engine light's on, feels like I'm driving a naturally aspirated snail. Struggling with serious turbo lag and the engine even stalls at idle sometimes. Fuel consumption's gone through the roof, and there's this distinct whistling, almost hissing sound, especially when I try to accelerate. I reckon it's something to do with the boost control system, possibly the wastegate valve itself. I have checked the throttle body for leaks and also the pressure sensor. Anyone else had similar issues before I start tearing things apart?

4 comment(s)

I operate a similar A Klasse. I experienced comparable symptoms some time ago, namely the reduced engine power, the hissing sound during acceleration and the check engine light being illuminated. The origin of the issue proved to be a defect within the wastegate mechanism. The functionality of the wastegate is integral to the correct operation of the turbocharger.

So, the wastegate then. Was it a simple fix, or did you have to replace the entire turbocharger unit? And did you notice if the boost pressure was erratic before it completely failed? I am trying to avoid taking it to the workshop, if possible.

In my case, the wastegate required replacement. I would recommend a diagnostic check to definitively confirm the fault. Given the complexity of the boost control system within modern engines, and considering your experience, it may be prudent to consult a qualified technician. The cost for the repair totalled 860€.

Appreciate the input. Seems like I'm heading down the same path. Confirmed the wastegate is faulty after further inspection. Bit beyond my home garage capabilities, so booked it in at the shop. Thanks again for confirming my suspicions.

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