My A/F gauge reads totally rich all the time (the last green led on the gauge). Then yesterday, I threw a CEL so I was going to check out what the code was but it was gone when I turned my car back on. Then today, I threw another CEL but again it was gone when I turned my car back on. So now I decide to hook up my datalogger to see what is up. I find that my car's O2 sensor is stuck at 3.79V no matter how I drive.

Does this mean my O2 sensor is toast? If so, shouldn't my CEL stay on all the time?

-Thanks

 

ttt

 

I dunno.. but my O2 sensor is not working properly.. the light only comes on every now and then(usually when im exiting the highway and i take it out of 5th).. but i am getting less than 20 mpg. I should be getting like 35 mpg!

I dunno what voltage i'm putting out from it.. but it can't be correct.

 

yes ur o2 is toast thats probably why it rich. o2 read .05 volts min lean and 4.95 volts max rich. so any thing less than 3/4 throttle its gonna be rich and above it will be lean. hope that helps.

 

Alright thanks