2003 honda Accord - Check engine light went on, went to autozone to have it

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checked, now light is off.? The code came back and said i needed a new O2 sensor. So i bought the sensor and all that jazz, but now the light is off and hasnt come back on in 3 days. Do i still need to replace the sensor? It cost 100 bucks so id rather not put it in if i dont need it.
 
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