O2 Sensor Voltage

richarcm Mar 31, 2018

  1. richarcm

    richarcm Test Drive

    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

    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

    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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