I have 00 F150, 62k Miles, 4.2

It keeps throwing a damn P0136 Code which goes to the O2 Sensor, Passenger Line, in the Cat. I've replaced it, disconnected the battery. Light went away.. 5 miles down the road it came back..

I had the code ran again, same code.. I dont know what else to do.. The O2 sensor has been changed, its the only one throwing a code..

Any help would be great..

 

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how old is the catalytic converter? what condition is the wiring in?