On my car, you measure it either at the EHA (with a harness) or at X11 (+ to pin#2 / - to pin#3) fully warmed up.
At X11:
You should get a fluctuating duty cycle (fixed is a fault).
50% fluctuating = stoichiometric
Lower %'s indicate leaning of the base mix
Higher %'s iindicate richening of the base mix
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