I have a code come up for this under 65 using obd1 style to get codes out my 98 lx.

Could this happen because I switch gas maybe from regular to 93? I just purchase the car it had no engine light after I put 93 gas which the owner told me he used the light came on after a day of using that gas.

How can I get rid of the issue do I change the o2 sensor and which one thanks a lot