Ok i have a 2000 maxima fed spec with stock manifolds and y pipe with a test pipe and full 2.5 in catback. ...i do not have a rear o2 bung so i was wondering if there was a simulator that didnt require one or of there was a way to make my own o2 simulator. ...im getting the Po141 code

 

Simulators can be tricky to get working. I would suggest that you have abung welded on and use the O2 sensor.

 

Ah ok thanks for the help

 

Any other help? Or advice? Brands? To do or not to do?

 

You don't need a sim. The code is a bad O2 since you dont have headers, etc.

 

Yes there isnt a o2 currently in there i beed know if i needa put it before or after test pipe

 

But im think bout getting headers n y pipe soon