ok guys, i have a 96 ek(dx) with a d16y8 swap(97ex motor, ex engine harness, 97 ex ecu)...heres the problem...i have 2 code throwing the check light on. and its both of my o2. i have my frist o2 hooked up on the headers(salter on). and i dont know where the other one gose. i have one o2 on my cat, but there's no where for it to hook up too..my buddy said that the dx, both of the o2 connector are on the harness not like the ex....the ex has one connector on the harness and the other connector on the bottom of the car where the o2 on the cat soppose to connect too.....can so one help me, im trying to pass smog with this car, its been setting since 06 sad.... do i need to get the o2 connector on the bottom of the ex to make it work, or can i just wired the o2 on the cat to the same one on the header?..im from CA, so smog is a bitch here. can so one help me.