How do I fix a problem with my Audi A7's engine?

My Audi A7's engine has been making strange noises and is not running as smoothly as it used to. I'm worried there may be a major issue with the engine. What steps should I take to troubleshoot and fix the problem?

First, it's important to properly diagnose the issue. Try checking the oil levels and looking for any visible damage or leaks. If you're not comfortable doing this yourself, take your car to a trusted mechanic for an inspection.