Does the computer have to be reset after replacing oxygen sensor?

yes computer has reset. correct o2 sensor vehicle? there multiple o2 sensors, upstream or downstream(before or after cat converter/s), possible left or right side? believe autozone free. can part on autozone.com or autopartswarehouse. can buy small obd2 scanner $40.00 can codes , reset pcm when want. depending if car newer 1996.

my check engine light on took , had tested light still on , truck run worst before

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