A/F Conversion

[pajeff02]

As noted in other threads, I utilize a Hypertech to read the sensor data and want to ensure that I am interpreting it correctly. My understanding is that the upstream O2 sensors should read around 450 millivolts (mV) when it reads a 14.7:1 A/F.

If the mV is greater than 450, this indicates a richer A/F; and, if it is less than 450 mV, then the mixture is leaner. Just checking to see if this is correct and if there is a conversion formula to obtain an approximation of A/F.

I am not having any problems and do not want to invest in a wideband aftermarket unit at this time. Just trying to use what I have to keep tabs on what is going on under the hood...

[Cutlass]

correct
1000mV is rich
10mV is lean