So my Durametric shows fault code P1682 - "Secondary-air valve final stage".

I have spoken with one of the sponsors here and we think it is part #2 in the diagram below. The part is just about $130.00.

Has anyone replaced the check valve? Or, has anyone had this fault code? I have searched the internet and various websites and it looks there is almost zero info about this.

I have read the manuals and it looks like I don't need to drop the engine for this.

Feeedback is much appreciated. Thanx.