Mine does make quite a bit of noise when it suddenly turns on in hybride mode when accelerating fast. It sounds like it makes to many revs and then goes down again.
When accelerating fast with the gear in sport it is also more present.
When you hear the ICE in idle I presume you have the gear in sport? Otherwise usually it would be switched if when the car is not moving? Maybe this could be why you can hear it better?
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