Quote:
Originally Posted by jamesj1996
yeah i think o2's are fine i have a buddy who works at nissan check the car out for issues every month he said its all fine. im getting uprev tune next week. thanks for the advice
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The O2's are pretty sensitive. If your originals were fine, removed, and re-installed, that alone could have damaged one.
My problem was a bad heater wire on the sensor after removal and re-install for headers. The O2 couldn't heat up enough to get out of the warm-up cycle. The result was mpg like yours and an intermittent stumble at idle.
Weirdly, it didn't happen right away -- it got gradually worse over time -- and other than the mileage and occasional stumble, it ran fine.
If you have a buddy at Nissan, ask him to hook up Consult III and monitor the O2 voltages, heater corrections, etc to make sure all is good.
Good luck!