the voltage of the h02s sensors at the stoichiometric point is 450 to 500mv, the voltage decreses
to between 100 and 500 mv if there is an increase in oxygen temperature ie a lean mixture,
the voltage increases to between 500 and 1000mv if there is a decrease in oxygen contaent, signifying
a rich mixture
does that help? i have no idea what it means but it looked good