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I randomly hear a semi-high pitched noise, sounding similar to a siren (sometimes I've actually turned my radio down and looked in my rearview mirror to see if a cop was trying to pull me over). It's been happening for a little over a year now, but no clue why or where it's coming from. It's hard to explain to a mechanic or the dealership, so has anyone else had this problem with their car? Any advice you have would help. Thank you!

 
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Possibly getting drags on belts, maybe power steering pump.