YOU SHOULD BE GETTING A 12 VOLT SIGNAL FROM THE WIRES WHEN THE KEY IS IN THE HOT IGNITION ON POSITION,LOW VOLTAGE IS USUALLY A FAULTY O2 SENSOR,BUT IF YOU REPLACED IT YOU MAY WANT TO CHECK THE WIRES,MAKE SURE THE CONNECTOR ENDS ARE CLEAN NO GREEN CORROSION ON EITHER END.MY 02 HAS 2 CONNECTOR ENDS ON IT AND THERE LOCATED UNDER THE PASSENGERS RUG,SOMETIMES THEY GET DAMAGED FROM BEING UNDER THERE OR MOISTURE DAMAGE,IF YOU FIND ISSUES WITH CONNECTOR END YOU CAN ALWAYS HARD WIRE IT WITH BUTT CONNECTORS.

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enjoy life,take the coal that is handed to you and turn it into diamonds. { PHILLIPIANS 4:13}