After driving around for a little bit and not running any o2 sensors Im going to hook up the pre-cat o2. (its running a little rich). I have the ors crossover. Im just wondering if there was a certain distance from the end of the crossover the the o2 should be placed. I was just wondering where people placed their o2 using a ors crossover or similar.

 

I put mine in just before my down pipe starts to turn horizontal, and it seems to have worked, well. No codes from the front O2 sensor. The rear, behind two high flow cats, is a different story, however. I'm planning to put a URD simulator in there.

 

Here's where mine is, the 2nd one without the copper heatsink is the Toyota precat sensor. That flange bolts up to the ORS cross-over. Just make sure you don't position it anywhere near the 6:00 position because water will settle on it.

 

So you're getting a P0420 with 2 cats huh?

 

Thanks guys I appreciate the info

 

Yeah, Dale, I'm planning to ditch the front cat (save it as a spare), and replace it with a flex coupling, to save my crossover, in the future.

I originally thought that having the two cat set up, similar to the factory scheme, would prevent the O2 sensor codes, but that has not been the case. So now I'll go with one cat and the URD simulator, to make the codes go away.