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#1 O2 sensor out, performance went up immediately. on 1996 Toyota Tacoma

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
What if I don't replace sensor? What should I do about engine light? Truck has 344,000 miles on it.
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(2) Comments
If you have had scanner attached and only has code for that sensor then should be inspected and repaired. It can cause cat conv probs. No explanation about why you feel the performance went up. What do you mean by that?
Hills that I use to downshift to 4th, I can stay in 5th with pedal to spare. Pick-up has also improved. Haven't noticed any change in fuel consumption. Can I remove CAT conv.? County I live in has no emissions inspection. Appreciate the reply. Thank you.