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How to block high frequency sound

So there is a car i got and had to sell back, Peugeot 508, due to high frequency/pitch noise the electronics made.
Since its not possible to replace any electrical components with ease, i wondered if it would be somehow possible to get a high frequency noise jammer, like radio signals are jammed. That'd be quite hard i suppose so i though maybe high frequency sound blocking cover? Unfortunately not, since the sound comes from behind displays and i cant block them.

Is there a way to block/suppress high frequency noises somehow? I think the sound is around 15000hz.
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