How do I know if my Audi A2 needs new fuel injectors?

I have noticed some rough idling and difficulty starting my car. Could it be a sign of a faulty fuel injector? How can I diagnose and replace them if necessary?

One telltale sign of worn out fuel injectors is reduced engine performance, such as poor acceleration or decreased fuel efficiency. To confirm if this is the issue, you can use an OBD-II scanner to check for any error codes related to the fuel injector. If the codes confirm a problem, it is recommended to have a professional mechanic replace them to avoid further damage.