How to fix the lack of power in my Audi A5 engine?

I am experiencing a noticeable decrease in power and responsiveness in my Audi A5's engine. I have checked for any leaks or malfunctions but everything seems to be in working order. What could be causing this issue and how can I address it?

First things first, make sure your fuel filter is clean and not clogged. A dirty filter can restrict fuel flow and affect the engine's power output.

Another common cause of low engine power is a faulty oxygen sensor. It is responsible for monitoring the air-fuel ratio and a malfunctioning sensor can cause a decrease in performance.

Have you checked your spark plugs? Over time, they can get worn out and cause misfires which can greatly affect engine power. Consider replacing them if they haven't been changed in a while.