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I believe it's the fuel pump. It kicks on to pressurize the lines under the assumption that you're about to start the car if you just unlocked it.
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Fun Cars (daily drivers) 2001-2016: 2001 Honda Prelude | 2016 - present: 2017 M240xi Glacier Silver Coupe
Family Cars: 1993-2014: 1993 Honda Accord 10th Anniversary Edition | 2014-Present: 2014 Honda Odyssey
Stable-mate: 2019 - present: 2020 230xi Seaside Blue Convertible
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