2018 A6 3.0 Sport.
I'm hoping some one on here might have some insight on this. I just had this at the Audi garage last week and they forgot to look into this. I bought this used a month ago and it
makes a clicking or relay sound when I push the start button and then that it's, just for 1 second when starting just before the video display make it's little noise coming out. I've searched the forum and came up with two other post that as a little similar but they were a 2000 and 2003 models and that's a wee bit too old for compare with.

 

Maybe the starter solenoid is trying to engage when you start your car.

 

Thanks, I'll have a look at that.