what should be the max voltage that comes out of the o2 sensor wire on hondas?

 

1 volt max

 

i have a primary and a secondary o2 sensor, which one should my a/f gauge be connected to?

 

Mine doesn't seem to get pass .9v. whats wrong?

 

your A/F guage should be connected to the primary o2 sensor signal output wire.

.9v is rich........why would you want it more than that?

at wide open throttle you want it to be around .850 to .900 to get the most power on a mostly stock engine.......