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What is this ? Pl see Pic attached
On my 2002 X 5, 4.6is ... Please see attached picture
While replacing vacuum tubes for a P0491 error -secondary air injection system insufficient air flow bank 1,
Arrow 1 (& finger) on picture
what is that gizmo called and its purpose ? The nozzle where the vacuum tube connects at its rear broke off. So need to buy used or new.
Arrow # 2
What do these things do ? & what is that knob at the front of that little box ? seems it can be rotated for something ?
Elementary questions for most of you....
Thank you
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