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  1. J

    O2 Sensor Heater Circuit -- Low Voltage at the Plug to the Sensor

    The plug that leads out of the ECU (To the upper bank 02 sensor is delivering 9 volts of power). When I keep the multimeter positive probe on the plug hot wire and place the negative multimeter probe on the engine block I get 12.5 volts; Which leads me to believe that there is a grounding issue...
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