How to fix low acceleration in Audi A3?

I have noticed that my Audi A3 is not accelerating as it used to. It takes longer to reach high speeds and struggles on inclines. What could be the cause of this issue and how can it be fixed?

One possible solution could be a clogged air filter. Check and replace if necessary. This can greatly affect the airflow and performance of your vehicle.

Another potential problem could be a faulty oxygen sensor. This can cause incorrect readings and affect the engine's performance. Have it checked by a mechanic to determine if it needs to be replaced.