0/2 sensors on 2002 Ford Explorer Sport Trac

check engine came on code said 0/2 sensors changed all 3 sensors.reset comp light came back on code said 0/2 sensors again .what do i do now?

Asked by for the 2002 Ford Explorer Sport Trac
Change the intake manifold gaskets.
2 answers
What was the exact code or code numbers stored? Were the codes stored for heater circuit or oxygen sensor performance issues?