I've recently noticed a persistent humming coming from the driver side wheel well of my 99 9-5. It occurs intermittently while the engine is off and constantly while it is on. I've attach a photo of the part that is making the noise. It is the small cylindrical piece located in front of and below the battery, denoted by a red arrow in the photo. Any ideas as to the problem and how to fix it? Thanks in advance.
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