Hope you can help me out here.

I was trying to hook up my narrowband A/F gauge to the secundary O2 sensor from my 2005 350Z. It can not be done to the primaries, because that is a wideband.
I was expecting a .4 - .6 Volt readout from the black wire, but it is a steady zero. Is this because the sensor first has to reach a certain temperature or is the secundary sensor only working if the primary fails.

Anyone??

Thanks,
Onno

 

kind of off subject but anyone know for sure if my check engine light will come on if i bolt4 up my o2 sensor to my test pipes?