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Black O2 Sensor?

Homeowner A
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Homeowner A Contributor

Homeowner A

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I've been having misfire issues with my UTV 400 when it gets warm and I've thrown all kinds of parts at it so far with no permanent resolution.  Today I removed the O2 sensor and it is black on the end.  To me that means it's running rich and/or the sensor isn't working.  I replaced the sensor with a new one and will see how it goes I guess.  With EFI, I'm wondering why the sensor would be this way with low hours and mileage?  Is there a way to adjust or lean out fueling on these?  Thanks in advance.  

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