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Squealing noise just happened


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Hi everyone.  My 2006 Boxster S suddenly started making a squealing noise.  Noise goes away at higher RPM, only to come back at lower RPM and at idle. Not related to gear or clutching at all. Noise seems loudest at the rear of the car; I can hardly hear it inside with the windows closed.  Is this a serpentine belt issue? Or the bearing of some engine accessory? I have 50,000 miles, and have already changed the serpentine belt once, around 4-5 years ago,  just due to age of the car. I have not yet had the time to open up the engine compartment to look further. If it's a belt, then I would expect more noise from inside the cabin, would I not?  I have attached a recording indicating the squeal going away when I rev the engine.

Recording 26.wav

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An update:

 

I changed the serpentine belt, but the same noise came back. Today my car threw a check engine light. I cannot remove the oil cap.  I suspect AOS has failed.  Time to check the code, but I really suspect AOS.

 

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