Knarrowing on the front axle

Hello, I have been hearing a knarzen doer gun from somewhere in front of me for a while with my Audi the more often – especially when driving left.. Where the noise comes from is difficult to locate, when driving sounds like there would be somewhere right in front of me on the other side of the spray wall That sounds like steering gear for me? On the other hand, I hear the same or at least a similar knarzen partly even when I park the car and get out.. something under tension and relax? And that comes then rather out of the wheelbox at the front left.. Meanwhile I hear the sound not only when steering, but also partly when driving over small bumps.. I would be grateful to everyone who can tell me where to start looking, what that is, because unfortunately I have no approach at all mfg kaindl