Need help with my 2000 honda civic
 

I have a 2000 honda civic ex So i replace my catalytic convertor and the heads and the two o2 sensor and tried to erased the check engine with a computer the check engine goes ways but comes back on and its keeps saying its the o2 sensors 1 & 2 please help !!!

what brand cat ??? what is ''heads'' ??? what brand oxygen sensors ???