I have been doing a lot of work with my o2 sensors and now i cant figure out with plug is for the primary and which is for the secondary.. can anyone tell me if this is right?



i know that the primary is before the cat and the secondary is after, but i have an lx to ex exhaust convert and messed my plugs up.. is the higher plug for primary and lower is for secondary?

thanks

 

The wire harness connector for the primary sensor has a white wire whereas the wire harness connector for the secondary sensor has a white/red wire.

 

So with the 2 black green and white wires the secondary plug in as a red stripe on it?

 

If my edits to your sentence above are correct, then Yes. And the primary sensor instead has a solid white wire.