O2 Sensor Voltage

richarcm Mar 31, 2018

  1. richarcm

    richarcm Test Drive

    Messages:
    4
    I've been struggling with various CEL codes since I bought my 2004 Xterra 3.3l. Lately they have been converter/O2 codes.

    I replaced the passenger side (bank 1) sensors up and downstream. I bought the cheap Kwiksen ones off of Amazon. The upstream sensor seemed to still have problems so I replaced it with a Bosch sensor. That seemed to help. And after that I also found a vacuum hose that was disconnected and since the the car has run much better.

    However today I got a P0037 code (bank 1, downstream...Kwiksen sensor) and while waiting in line at the car wash I noticed that my temp was at 219 degrees! I'm not sure if the two could be related or not. I replaced the thermostat, water pump, hoses and coolant just a few months ago. And the fan seems to be working. I'm not sure what that was about.

    Attached is a snapshot of the 02 sensor voltage. What does this say? To me it looks like the Kwiksen sensor (bank 1 sensor 2) is bad. But bank 2 doesn't look right either. Bank 2 almost looks like a bad converter.

    Any thoughts??
     

    Attached Files:

  2. Muadeeb

    Muadeeb Bastard Admin from Hell Admin

    Messages:
    15,911
    Location:
    Dallas
    No, that's not too far off. The sensors only put out about a volt max, and should swing from 0.25v to 0.75v
     
  3. richarcm

    richarcm Test Drive

    Messages:
    4
    Okay but the downstream on the passenger side is flat lined and the downstream on the driver side is almost mimicking the upstream. Neither seem to be right to me.
     

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