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strange question....why do you need to know? with decent diagnostic equipment, you can read o2 voltage from the obdII port in real time. I wouldn't go probing in the ecu...nothing good can come from it.
Do you happen to know the voltage that is running to the heater circuit to the very last o2 sensor

i have 3 and the post cat heater wires with ignition key on is only getting .60v …. That can’t be right
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