How to troubleshoot common engine issues in the Audi A6?

I've been experiencing some issues with my Audi A6's engine lately. It seems to be lacking power and making strange noises. What could be causing these problems and how can I fix them?

There are a few potential causes for engine issues in the Audi A6. The first thing you should do is check your spark plugs and replace them if necessary. Next, check your air filter and replace it if it's clogged or dirty. If these steps don't solve the problem, it could be a more serious issue such as a faulty fuel injector or a problem with the catalytic converter. In this case, it's best to take your car to a trusted mechanic for further diagnosis and repairs.