CV Diesel sounds similar to rattles

Hello, I’m sorry about your help/experience/opinion…before I go to the dealer because of event. “Nothing” was so bad. With my CV Diesel 2.2 D 136 PS BJ. 12/05 I’ve had a lot of noises like “Rasseln” or “lauteres Dieselnageln” when giving gas (definitely from the engine compartment!). Last oil change before 350 km!!! Especially at about 2,000 – 2,500 u/min. I stopped the noise when I bought it about 1.5 years ago. I told the dealer that he should check this time before I buy the car….the noise was then “way” and of course I didn’t ask what it was about:-(and since then the noise has been going down to the country. Since then, I don’t have a lot of noise at that time?