Turning off rear O2s?

[georgio440]

I was messing with my Xcal 3 and noticed I could turn off the rear O2s. What would be the purpose of doing this? Any benefits?

 

[SaleenGT2001]

to not throw a code if you had an OR X pipe

 

[2000fordstanggt]

all the rear o2's do is make sure the cat is there/working. the front o2's are what the engine uses to adjust fuel ect..

 

[georgio440]

Hmm, maybe that explains why my CEL came on again after installing the tune. My rear O2s are on. I should probably turn them off, no?

 

[SVT32VDOHC]

I would turn them off. I have an H pipe on my 01 GT motor that's in my notch, and I have a CEL. It has the stock tune, so I should prolly get it tuned.

 

[Hardtop68]

I have MIL eliminators put on the rear O2s... 2000FORDSTANGGT is right...