What are the common problems encountered with the Audi A4's turbocharger?

I recently bought a used Audi A4 and I've noticed some issues with the car's performance. I suspect it has something to do with the turbocharger. What are the potential problems with the turbocharger of the Audi A4 and how can I prevent them?

One of the most common issues with the Audi A4's turbocharger is a lack of power. This could be caused by a number of factors such as a clogged air filter or boost leak. It's important to regularly check and replace the air filter to prevent this.