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Opinions differ on this. My personal opinion is, not neccessarily. If the other is ok, then why replace a known good part? But the owner of the car needs to understand that the other one can fail at any time, and the check engine light would come back on, if that happens. If the owner wants to, for the sake of future reliability and has an extra $100, or so, burning a hole in his pocket, then replace it, if he so desires. Usually, when the technician working on the car says to replace it, he is covering himself for any possible future issues relating to the other O2 sensor.

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โˆ™ 2006-03-02 15:44:17
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Q: Should you replace both O2 Sensors for 2000 Maxima if one is bad?
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