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Hello, my name is ***** ***** I am a professional here at Justanswer. Thank you for your question and I will assist you with your concern.With the vehicle parked there really should be no rotating parts in the rear and you may be right and the noise is coming from something else. Are you able to make a video recording of this noise so we can hear it and post a link here to listen to it?
So this isn't my vehicle, but some YouTube clip that sounds very similar. I'm going to go check if mine sounds similar...think it does:
The first thing that comes to mind if your sounds like this Vid is the catalytic converter. If you get down under the and place your ear as close as you can with out getting burned dose this noise sound like its coming from the converter?