Secondary Air Pump

[S25MRS]

Anyone know what noises I can expect in the bearings are on their way out? Assume it would be a whirring noise of some sort (all through rev range?) but surely only until engine's warmed up?

About to have the belt/tensioner changed on mine, but wondered about the Sec Air pump at same time?

Any other possible causes of a whirring noise at all revs that I should investigate?

On my 2003 B6 S4, by the way,


Cheers

[dace]

My secondary air pump is fairly noisey, however only on cold start up. Perfectly normal IMO

[Virdee Autos]

Yes secondary air pump will only come on start-up to lean out the mixture.

I would have just thought, you get all the tensioners and rollers replaced on the timing belt side, the drive/aux belt tensioner, and water pump aswell.