Help! S8 Scary Engine Noise...Worried

[mark_le_b]

Originally Posted by ainarssems

Hard to say from video but it could be secondary air injection pump if the noise come from air filter box area in which case you could just temporarily disconnect it. If you have VCDS you might be able to test it using output tests or as Audi call them final control diagnosis.

I did have a fault code for that a while back (from a hand held diagnostic) - the noise sounds higher up than the air filter box

Noise seems to resonate more when I take the oil filler cap off....