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What causes the exhaust valve to function ?
I know it’s uses a power switch but what triggers the switch to operate
Is it vacuume or pressure can it be triggered manually ?
2018 330i
 

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I believe it should throw a fault code if it is not working correctly, that can be checked by using ISTA. I would imagine you could test the operation of the flap using ISTA also.

Otherwise I think you should be able hear a difference whilst driving, my 320ix doesn***8217;t have one so I cannot confirm that.
 
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