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Hello and welcome! My name is ***** ***** I can assist you with your question. Here is a wiring diagram for these 2 oxygen sensors.
The 4 wires coming into the bottom of the oxygen sensors (two on each sensor) are grounds. They should have no voltage. The heater control circuits are going to be battery voltage only when the computer wants to heat up the oxygen sensors. This is usually on a cold start or as the engine is warming up. The o2 sensor signal will fluctuate. It may have a reverence voltage with the sensors connectors unplugged. .5 or 1 volt.
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