So I replaced my 02 sensor and I still have a check engine light I have manga flow headers with a catalytic converter I tried resetting the ecu and taking off and it comes back on and I went to check it out at auto zone to see if it was something else it says bank 1 is bad but it's new so I don't know what to do

 

Year and model?

Specific code? There are 2 circuits in the O2 sensor (heater circuit and sensor circuit) with separate codes.