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did you verify power to the O2 sensors heater circuit????
did the car code for this????
what tests for the O2 sensors????
if you have a scan tool. do the O2 heaters come on when the engine is first started after a cold soak???
do not understand, do the heaters show on with the scan tool???
they can still switch as usual. if you verified voltage to the sensors as you sad, and do not turn on as they should, you may have a failed pcm. based on the ect sensor, the pcm should ground the heaters and trun them on when cold. if all the indicators are good, then the pcm is the last possibility.
how are you making out