Need some help with Oxygen (O2) sensors

[Josh40601]

Hello everyone, I have to add O2 sensors to my truck and I need to know where they were located from the factory, but I also think I may have problem with my current exhaust setup.

I found some info in this thread http://www.explorerforum.com/forums/showthread.php?t=320348&page=3

when the engine was installed, it didn't have anything past the exhaust manifolds, so I put a set of 2.25" pipe into a Y and a single Hi Flow magnaflow cat with another pipe to a generic turbo muffler then a turn down.

Plan was to put the 2 upstream in the new pipe in front of the cat, and the downstream behind the cat, but from what I was reading in that thread, the 302 has 4 sensors instead of the V6 which has 3.

Can anyone assist?

 

[adsm08]

Well if there are supposed to be 4 it would have been due to a dual cat design. So you would have a cat on each bank, an O2 sensor for each bank, and a cat monitor sensor (the downstream) for each bank. If your setup only has one cat you can just put two down stream sensors in one pipe to get the light out.

 

[Josh40601]

Well if there are supposed to be 4 it would have been due to a dual cat design. So you would have a cat on each bank, an O2 sensor for each bank, and a cat monitor sensor (the downstream) for each bank. If your setup only has one cat you can just put two down stream sensors in one pipe to get the light out.

This is what I was thinking as well, but wanted to see what others who are much more familiar with the sploder setups. Its out of a 97

I also was really hoping I could do the dual O2 sensors so I don't have to buy all new crap. Have you or anyone else done this?