Does anyone know what the front O2 sensor is supposed to be reading at? I ran an OBDII data logger and I want to know how much the front reading should differ from the back O2 sensor. I just need some approximate numbers. Thanks for the help guys!

 

close to .5 volts at idle and cruise. .95 or higher at WOT.

 

It keep switching from .1XX to .9XX volts. The rear O2 sensor voltage can not mirror the front O2 sensor for more then a few second, if it did the ECU will turn on the check engine light and store a P420 code.

 

Thanks guys for the replies. I know they don't read the same simultaneously but has anyone gotten readings of both at max?