Where do the o2 sensors go now??
 

I installed the headers and new catback system now. So where do the o2 sensors go? I have a port at the beginning of the headers, at the end of them, and then one on top of the catalytic converter. Notice that this a honda civic lx sedan.

Where are the holes on the header? Sounds like you did the EX/SI exhaust swap on your LX.

https://www.hondacivicforum.com/foru...version-73237/

I did do the swap... Facing the car, the first port is on the far left pipe, about 12 inches down. The next one is at the end of the header's pipe under the engine right before the cat connects, and the last one is directly on the cat. Where should the o2 sensors go where they would function properly, and which holes should I plug??

I just so happened to open that thread you attatched for the LX to EX exhaust conversion, now I see where the sensor go, lol, thanks!

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