How much would it cost to replace the oxygen sensor on a 1997 4runner, Toyota on 1997 Toyota 4Runner

It keeps the engine light on and wont let me pass the smog test in NYC.

Asked by for the 1997 Toyota 4Runner
Depends, are you doing it or going to a garage. You need to get the code read so we know which oxygen sensor it is.
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$200 to $250 is reasonable.