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02 Grand Prix – po137

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  • November 2, 2015 at 8:26 pm #843389
    Jeremy WinterJeremy Winter
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      Hey Guys,love the forum but first time posting.

      I have a 2002 Grand Prix 3.1 this time and it is throwing a po137. Checked the live data and that downstream sensor would start off fine and show good normal voltage between .4 and .6 but then the longer I drive it creeps down to 0 where is bottoms out and ultimately stays after about a 15 min drive.

      Popped the old o2 sensor out (obviously garbage) and replaced with a known good sensor from another Grand Prix I have. Same thing happens with that one.

      What would cause it to start off great but then lose function after warming up if it’s not the sensor?

      Any help is much appreciated.

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    • November 2, 2015 at 9:23 pm #843395
      CharlesCharles
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        Exhaust leak on that side? Reading too lean on that side. Perhaps clogged injectors. How does the upstream O2 sensor look and can you measure fuel trim data?

        November 2, 2015 at 9:29 pm #843396
        Jeremy WinterJeremy Winter
        Participant

          Thanks for the reply.

          There are no obvious leaks but may end up dropping the exhaust to take a better look. My only doubt here is that the sensor operates as it should for the first long while.

          Upstream looks great. No issues there.

          I have been looking at the fuel trim data with a scan tool.

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