i need help

99' BMW 528i someone concted a hose that fell off of the expansion tank to the Secondary Air Injection now blows white

i have a 99' BMW 528i and someone concted a hose that fell off of the expansion tank to the Secondary Air Injection and it blows white smoke now what do i do. it also has like hardly any power when i try to acclerate

well, maybe the hose didn't belong there and water is now sucked into the engine. That or now the head gasket is blown. Try this video test https://www.youtube.com/watch?v=QA7KVQq9vKA&t=4s

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