safi24

Hello, new to the forums here.

A couple days ago my 2004 s4 (b6) has a whining noise that is always on and coming from one of the hoses near the intake pipe.

The noise is always there now since a couple days ago, it used to be every once in a while. The noise doesnt start when the car is switched to ON position, but the noise comes on and stays on at all times as soon as the car starts. Noise goes away completely after the car is turned off.

I have pasted a link to a video i posted on youtube of the hose that is making the noise. Maybe the hose has a leak in it? The hose is also vibrating from the noise.

Car:

2004 s4
4.2L v8
6 speed manual
No check engine light, but was misfiring and CEL came on for a day, then went away. (Happened a week ago)
110xxx miles
Air filter is clean
Only mod is catback exhaust
Will need an oil change soon
All fluid levels are good/at maximum

VIDEO:
https://youtu.be/1ekdNXXjn3Q

I searched and couldnt find anything any help would be appreciated. Thanks