Malfunctioning in O2 sensor bank 1 sensor 2?

2000 Ford F-250 O2 heat circuit failure 140000 miles
Failure heat circuit bank 1 sensor 2. Checked all fuses changed O2 sensors both SENSOR 1 AND 2. Sensor 1 cleared up but sensor 2 is still malfunctioning.
410merkel from United States a year ago  
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5 reports 
410merkel from United States a year ago
I checked that first.
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