New O2 sensors, CEL?

NoTecLs

Big Foig
Hey guys, i recently got a new cat and replaced the O2 sensor while i was at it and now the CEL keeps popping up. i erased it by unplugging the battery, than it came back on again.... Now i bought a code scanner and it reads PO133 which is O2 Sensor CKT Slow Response. Anyone have this code before?
 
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