I have a 2000ex and got dc headers for it, the new 02 sensor plug is in the middle of the header, my question is where do i plug the other end into?

primary-> header

secondary-> cat

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Ya the header one where do i plug it into?

ANYONE

on 2000 EX the primary goes in the downpipe of the header right before the cat and the secondary goes into the cat. There should be a place to thread the o2 sensor in right on the top of the header by the engine and a second spot on the down pipe. You need to plug the top bung and put the o2 sensor on the lower spot.

I still dont see whereto plug the primary plug. it comes off the mid header and where does it go to, its a square plug. The other oneon the cat goes up into the car, help me!

i know this is an ebay header, but its a good diagram

^ it has lines pointing to the 2 o2 sensor bungs, with the header you should have a gotten a plug for each hole like that picture shows. Plug the top hole and put the primary sensor in the secondary hole farther down the header, then i think you just leave the secondary sensor alone since you've got an EX.

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ya the top one closer to you i pluged the sensor into it, now where do i plug the other end of that wire, it is a square block it has to go somewhere so it can read it

there should be a harness that you plug it into just to the left of the header, the one you unplugged the sensor from.

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Ok i will look, where does that wire go to?just incase i cant find it, i didnt put my header on