Looks like the plug connector for the swirl flap actuator. Can't actually see a swirl flap actuator fitted to the end of your intake manifold (may have been blanked off by previous owner?)
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Current: 2009 E90 325i M Sport Auto
Previous: 2017 435d xDrive Gran Coupe, 2010 E90 318d SE, 2009 E90 318i SE.
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