I'd have to disagree as far as the P.O.S. rating of the hks ssbov.

i ran one for the longest time and the only complaint I had was their flanging method. I hated that fucking slip ring.

the design of the valve itself is flawless. you can get a recirc kit. I would just do that.

I can't imagine it throwing a check engine light.

did you unplug something accidentally while you were putting it in?

check for loose connections.