O2 Sensor Voltages | Ford Explorer Forums - Serious Explorations

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O2 Sensor Voltages

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April 4, 2011
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City, State
Bonita Springs, FL
Year, Model & Trim Level
2000 XLT, V6 OHV
Anyone here familiar with “normal” voltages for O2 sensors? Two of my sensors appear to be functioning correctly and are on opposite voltages. I’ve read before that it should be that way. However, the third sensor on bank 2/3 stays steady around .790 volts. Any idea if that’s bad? I appreciate any advice. Thanks.

I took this screenshot after driving for an hour:
1DD8EA8E-A611-4830-9F26-0036411B73F5.png
 



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The third sensor is just for monitoring catalyst efficiency, so I'd anticipate it being relatively steady.
 






The third sensor is just for monitoring catalyst efficiency, so I'd anticipate it being relatively steady.

True. Only the 2 pre-cat sensor really do anything.
 












A lot of good info. Thanks for the replies, I tagged the post so hopefully it helps someone else out. It’s impressive that the sensors are still operating within spec after nearly 20 years.
 






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