I replace all Co2 censor I was getting code to replace Im still getting check en

just because the code reads o2 sensor issues doesn"t mean its bad it means its not reading correctly.it could be other issues causing it to read wrong. seek a mech with a scanner to diag issue for you

Was the Co2 sensor the ONLY error code when you did the code test? Most likely there will be a few listed. If there are more codes....go down the line. Make sure you disconnect the negative battery cable to "Reset" the system 1st.