Engine noise

[R2E]

Hi All 🙂,

My 2021 Audi A3 has recently developed an annoying knocking sound which seems to be coming from around the area circled in the attached photo.  It's definitely coming from above the timing belts, and pulleys etc.  Performance isn't affected, but obviously something isn't right.  Has anyone any idea what this could be?.

[joe6]

Does it increase with engine speed? First thought was possibly an injector problem but just a guess.

Edited yesterday at 04:51 PM by joe6

[R2E]

Hi,

It's almost impossible to hear it when driving, I only really hear it when the car is ticking over, so I'm not sure. 

It only seems to start about 20 or 30 seconds after I start the car as well, not as soon as the engine starts.