Running rich

[RRwhipple]

Ok so running whipple setup, tuner shows my passenger side upstream o2 sensor wasn't working, installed a new one and now my passenger side upstream sensor is running rich, any ideas what would of caused that when the right side was running perfectly fine before I installed the new one on the driver's side

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[ORRadtech]

Did you use a genuine OEM sensor?

 

[RRwhipple]

Yes, its not the side I replaced thats the issue now, the driver side upstream wad reading at 0, changed it now the passenger side upstream is read about 15 points below what the driver side is reading

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