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Incomplete o2 sensor - Nissan Versa 2012

Hello. My Nissan Versa 2012 (registered in Palmdale, CA) is unable to pass the smog because the downstream o2 sensor keeps saying incomplete. We’ve continuously drove the car at various speeds and times in hope of fulfilling the drive test cycle but nothing has worked. We’ve also replaced the part with an original part from the dealer. The check engine light on the vehicle is not on and that’s the only sensor that is showing as incomplete. Any advice?
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