Please help me identify this part!
Just wondering whether you can help me identify the part that's circled in yellow. I've diagnosed an engine whine on my 2008 C300 that appears to be emanating from this component, yet, I have no idea what it is.

Thanks!

EMISSION SYSTEM / EMISSION SYSTEM / EMISSION COMPONENTS / A.I.R. pump
A.I.R. pump 3.0L & 3.5L
http://www.getmercedesparts.com/part...iagram=5777160
Last edited by AkaSigFreak; Nov 25, 2012 at 08:32 AM.
AkaSigFreak, are you a tech by any chance?!
Does anyone know what the implications are for a failed excess air pump and how much it would cost to replace?
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AkaSigFreak, are you a tech by any chance?!
RLE, it whines only when throttle is being applied and seems to be most prevalent around the 1500rpm to 3000rpm range.
Glyn M Ruck, I cannot ascertain whether the excess air pump has shut down after warm up, but the whine is there when the engine is cold and when warmed up.
Does anyone know what the implications are for a failed excess air pump and how much it would cost to replace?
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