[OuttaCtrlHemi]

I believe the O2 is like a battery...from 0 to 1 volt not resistance. It has to be hot to actually produce a voltage with the amount of O2 in the exhaust stream. The difference in voltage between the front O2 and the rear O2 tells the computer the effeciency of the cats.

 

[OuttaCtrlHemi]

The 2004 repair manual describes the O2 sensors as operating in a range of 2.5 to 3.5 volts after they have reached normal operating temperature. All other performance features are similar to other O2 sensors, i.e.- Higher voltage=less O2, lower voltage=more O2.

Thanks for the clarification...knew it was voltage, but remembered way back when it was around 1 volt. Been a long time since I kept up on these things...and boy have they changed :banghead: