Seems out of nowhere there is a noise in engine area. Around 500km ago it had work done on engine. It's like a clicking sound Or rattling around lower area.

Oil is good.

Odd noises are the hardest to say what it is. Does it do it while only moving? Does it get louder or faster when you rev the engine? Any info you have will help us point you to start looking.

Yeah man, the specifics would be of great help to determine the cause of the noise.