Heated o2 sensors

[GR11M]

Should the heater control for oxygen sensors 11 and 12 both come on until they heat up and then go off, only my sensor 11 comes on and stays on ?

Also heated exhaust gas oxygen sensor heater bank 1, sensor 1 and bank 2, sensor 1 come on but bank 1 sensor 2 and bank 2, sensor 2 don't. Is this normal ?

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[Cory S]

All 4 Sensors are HEGO’s. All 4 are all heated. The upstream 2 use PWM PCM controlled signals to the heaters.