hey i'm swapping my 91 si's d16 for a b16 well i got my motor and as i'm looking at it i'm noticing that there are 2 o2 sensors behind the headers. damn that sucks to replace them! well i'm wondering what do i do w/ them my d16 only has 1 o2 and i got the ha subharness but haven't recieved it yet. what will i have to do to hook these up? do i even have to hook both up? i can get my hands on a 99/00si dc headers should i just get them?

 

The 1992+ B16A only has one oxygen sensor right before the cat.

 

ttt

 

well it's not too hard to add in the wiring for the stock exhaust man. If you go with an aftermarket one you will need to splice or weld in a bung for the secondary 02.

 

if your setup is a first generation b16, then it's OBD0 or non-OBD. And what he ^ said, apparently splicing them works well (this is if you get the DC header that only has 1 spot for 02). Otherwise, you can use the normal header and your wiring harness should account for them since the ecu is looking for o2 sensors. My new ecu apparently takes out the second, so I shouldnt have to worry about it anymore.