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Oxy sensor ( code 64) testing the wiring with MM

commodoredave

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VT II sedan no turbo or supercharge.
testing the wiring ( not the sensor) with a multimeter. engine is cold and switcvhed to pre ignition, Engine is not running.
the wiring ( 2 wire, signal and ground) shows a 0.67 voltage ( MM set to DC 20v)
The on-line vids on the subject suggest 1.67 volts is the desired reading but both both left and right wiring being off by exactly one volt seems suss.
Also, only one sensor is generating a fault code.
Does 0.67 volts imply the writing and voltage are good?
 
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