I've read about people having to relocate their o2 sensors during certain exhaust modifications.... but if I install a y-pipe and catback on my 3.0, will it require any o2 sensor modding? I've also read that it depends on if your car is Cali or Fed spec, if so, how do I find out? Thanks...

 

Its in the FAQs under "Exhaust"...

http://forums.maxima.org/showthread....935#post275935

 

just to sum it up.

all 2001's are cali spec. A y-pipe and catback made for your vehicle will not require relocation nor modifications of the o2s.

 

ok thanx for that......im guessing that goes for headers as well?

 

no. cali spec y-pipes utilize only TWO o2 locations; one on secondary arm of the y-pipe and another one on the primarily arm.

The stock front manifold and precat o2's are still in place, even with an aftermarket y-pipe. However, for headers there are only 2 o2 bungs for the front and rear primary o2's and the secondary o2s have to be relocated after a catalyst or else you'll throw a p0420 (bank 1 sensor 2) and p0430 (bank 2 sensor 2) for catalyst inefficiency because the headers take away the precats on the manifolds.