check engine light is on,diagnosis is cat converter. do i need to replace spark on 1998 Lexus ES300

recently had oxygen sensor replaced.engine runs smooth .cat converters is expensive. will that solve problem of check engine light?

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2 answers
poss but just because the code says catt is bad doesn't mean repl catt it means there is not enough diff in data from frt o2 to rear o2 but that could be a fuel trim issue. poss injectior,fuel regulator ,or other fuel issues
it may, or may not