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Any findings on the constant hissing noise coming from the rear while engine is running? Mine is a 2010 E70 X5M. I’m having a similar constant “hissing” that I hear at idle. I thought it was my air bags, so I removed all the underbody panels to check if the compressor is running and it’s not and the hissing is persistent, and the car hasn’t sagged after being parked for over a week. The noise sounds like it’s coming from inside the gas tanks when I put my ear up to them with the under panels removed. Seems to be on both sides. Any ideas? No check engine lights.
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