hey i have a palm m515 with the pocketlogger and i been having this code it say 02 sensor circuit slow responce (bank 1 sensor 1) and p0420 catalyst system efficiency below threshold (bank 1) is there anyway i can fix this do i need to replace the 02 sensor? i can clear the codes but it keep coming back on after a few miles. does this effect my performances?

My mod is stock motor with fmax turbo kit
i didnt use the mf2 i used a fmu
apexi n1 cat etc.....

anyhelp plz