Ford Expedition

97 Ford Expedition, 175k, 8cy
I got the code P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
Had the sensor replaced and the code came back in 2 days. Had the sensor changed again and the code was still there. Checked all the sensors while driving the car and get no reading from the problem sensor. The other 3 are sending info. Check the O2 plug and there is power there. What could be causing the sensor to not get info to the computer. It is the sensor behind the cat.
November 3, 2007.

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