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Question Answered: 

check the voltage at the sensor for true voltage.Possible open circuit or fuse blown.the down stream sensor wiring can short on heat shield ive seen several do check voltage ,use straight pins and push into the wires at about a 45 degre angle about an inch apart so they cant touch each other. when you are through you can remove the pins and rub the spot where they are inserted to seal the opening.

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