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O2 Sensor Voltages

Discussion in 'Stock 1995 - 2001 Explorers' started by 239, October 4, 2018.

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    1. 239

      239 Active Member

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      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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    3. koda2000

      koda2000 Explorer Addict

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    4. fastpakr

      fastpakr Elite Explorer

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      The third sensor is just for monitoring catalyst efficiency, so I'd anticipate it being relatively steady.
       
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    5. koda2000

      koda2000 Explorer Addict

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      True. Only the 2 pre-cat sensor really do anything.
       
    6. Tech By Trade

      Tech By Trade Well-Known Member

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      Your rat sensors are fine. That is what they are supposed to do, rat out chopped cats.
       
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    7. 239

      239 Active Member

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      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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