Dual 02 sensors

[mjmonday]

My truck has 2 02 sensors and my IFIE is'nt working on the left side. After doinig some checking, the left side with the IFIE off reads .02 to .09 mV and the right side reads .02 to .05 mV. My IFIE puts out about .08 mV. So I can enhanse the right side but I dont see any difference in the left because of the higher peek reading.
Is it normal to have this much of a voltage difference from one sensor to the other. Thanks mj

[atfab]

You need to adjust both pre-cat sensors to get proper results. I don't know if your EFIE can do this. Not all will. Check with the source of your EFIE to find out what you can do.