does anybody know if the 997 turbo has a wide or narrow band o2 sensor, i only see 4 wires for each sensor, my research tells me a 4 wire is narrow band , is that true? the reason i am curious because i am reading between ~.4 to .75 volts on the plx gauge, i am trying to see if i can extrapolate afr reading from that. i know narrow band goes from 0 to .9 v

 

OEM are wide band.

 

that is interesting then i am wondering why i am seeing no more then .8 v, if its wide band then it should be from 1 to 5 v unless the ecu does the conversion?

 

Definitely wide band capabilities. Datalogging reveals this. If you throw in some e85 I bet you will see higher voltages. At idle, stoichiometric (14.7/1) bounces back and forth anywhere between 0.1-0.9v with ~.5 being stoichiometric.