What is the common issue with the Audi A2's TDI engine?

I recently purchased a used Audi A2 with a TDI engine and have noticed some strange noises coming from the engine. What could be causing this issue and how can I fix it?

It's likely that your TDI engine is experiencing carbon buildup, which is a common issue with these engines. I would recommend getting a professional cleaning done to remove the excess carbon and improve the engine's performance. However, make sure to follow Audi's recommended maintenance schedule to prevent future buildup.

I had the same issue with my Audi A2's TDI engine. It turned out that the fuel injectors were clogged, causing the strange noises. I would suggest getting the injectors cleaned or replaced, depending on the severity of the clog.