Where is the swirl control valve control vacuum switch on a nissian sentra 2001

Question

I have a 2001 Nissan Sentra 1.8 cylinder. And my father and I can not find where the swirl control valve control vacuum switch is located. We took our code and it was a p1165. And that is what it told us was the problem. Could you help us out on finding the location of it? Thank you.

Answer 1

check for broken/loose hose first (see picture below)