I have a 2000 honda civic ex coupe...My check engine light came on and i ran a dignostic test and it says i have a bad secondary oxygen sensor...So i brought the new sensor and me and my friend got under the car and we seen the secondary sensor(after the catlayac converter) running up to somewhere in the car...I was jus wondering where do you plug it in to?...I dont have a car manual so i was wondering where its plug is located before i start tearing stuff apart...Please help...