97 Lumina LS 3.1 02 sensor 1

My check engine light shows that my 02 sensor 1 has a slow response. I see where it plugs into the exhaust manifold, but I dont see where the other end goes. Where does it go to and what do I need to know before I tackle this difficult job? I see several different brands of 02 sensors; are some brands better than others? Thank you for your help.

There’ll be an electrical connector on the other end that connects it to the wiring harness going into the ECU.

A Haynes manual should show you. It’d be a good investment.