Strange sound when accelerating

[Audi3.0btdi]

Hello! I have Audi A6 C7, 3.0BtDi from 1 month. I like the car a lot but there is one strange noise that bothers me. So.. when engine is cold - no noise, but when it reaches 90 degrees and i drive more thna 20-30 minutes it start making some noise when i accelerate from 1200 - 1400rpm. It bothers me a lot and i would know if someone can help me. I will attach a video too. ( on video i'm already on high kms and i just press the pedal between 1200 rpm and 1400 rpm ) . Thank you!

Video: https://youtube.com/shorts/__FTZCWqo0o?si=f-sdi1tTAHIlYWSI

[Audi3.0btdi]

Can somebody help me with some information, please?

[cliffcoggin]

Niso.

If anybody was able to help I am sure he would have done so by now. All I can suggest is that you take the car to a garage.

[Audi3.0btdi]

My mechanic said that it is fuel nozzle in the low rpm because it needs fuel to goest there and this causes the sound. What do you think?