Do you have a wiring diagram and a digital multimeter?
My first check would be to see if there is voltage between the heater and ground pin of the O2 sensors with the ignition on. I don’t think the engine has to be running, the purpose of the heater in the O2 sensor is a faster warm up of the sensing element.
Be sure to stay away from the signal pin, an analog meter doesn’t have enough input resistance and can short out / ruin the sensor, or so I’ve been told. One might get away with it using a digital meter, but why take the chance? That reading comes up nicely on the scan tool anyway.
It’s a place to start. Good luck and keep us posted.
My first check would be to see if there is voltage between the heater and ground pin of the O2 sensors with the ignition on. I don’t think the engine has to be running, the purpose of the heater in the O2 sensor is a faster warm up of the sensing element.
Be sure to stay away from the signal pin, an analog meter doesn’t have enough input resistance and can short out / ruin the sensor, or so I’ve been told. One might get away with it using a digital meter, but why take the chance? That reading comes up nicely on the scan tool anyway.
It’s a place to start. Good luck and keep us posted.