What causes a reduced engine performance in the Audi A1?

I've noticed a decrease in performance in my Audi A1. What could be causing this issue and how can I troubleshoot it?

A clogged air filter could lead to a decrease in engine performance. I recommend checking and replacing the air filter if necessary. Keep up with regular maintenance to avoid future issues.

Another possible cause could be a faulty fuel injector. This can be diagnosed with a diagnostic scan tool. I suggest taking it to a mechanic for a proper diagnosis and repair. Don't ignore this issue as it can lead to further damage.

Low fuel pressure can also cause a decrease in engine performance. Check the fuel pressure and if it is lower than normal, there may be an issue with the fuel pump or fuel filter. Again, it is best to take it to a professional for repair.