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You could use a Digital Multi Meter and back probe the first connection from the sensor.
Back probe the Sensor side of the connection. get the Sensor up to operating temp. and see if you get a voltage signal. if not the sensor is toast. If you get a voltage signal then you have a wiring issue.
I believe these O2 sensors are four wire. look for two wires that are the same color, usually white but not always. They are the heater circuit. probe the other two they are the signal wires. Polarity doesn't matter.
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