Chasing check engine light issue
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    1. #1
      Junior Member Islay's Avatar
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      Sep 2020
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      Chasing check engine light issue

      Hi -

      Intermittent CEL on a 2015 S80 2.0 Drive-e PZEV w/31K miles.

      OBDII code P0171

      So far:
      1. Replaced MAF
      2. Dealer smoke tested and replaced Breather Box/Oil Trap

      Light off for a few miles, now on for 1.5 weeks. It turned off for about 20 miles out of the last 300 miles.

      Anyone else have difficulty with CEL diagnosis on the 2.0 Drive-E?

      Would appreciate ANY recommendations or conversation on similar experiences.


      Thanks

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    3. #2
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      If no vacuum leaks are found I would replace the front O2 sensor.

    4. #3
      Junior Member
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      Jul 2016
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      i agree with Tech, front 02 sensor.
      Bank 1 Sensor 1, closet one the the turbo.
      Also have the dealer do these 2 things, Battery reset and also go in with VIDA do an ECM adaptation reset.
      I can not remember the exact name of the ECM reset to do with out looking at VIDA.
      Your dealer techs should know where to look to perform this reset.

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    6. #4
      Junior Member Islay's Avatar
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      Quote Originally Posted by volvogod View Post
      i agree with Tech, front 02 sensor.
      Bank 1 Sensor 1, closet one the the turbo.
      Also have the dealer do these 2 things, Battery reset and also go in with VIDA do an ECM adaptation reset.
      I can not remember the exact name of the ECM reset to do with out looking at VIDA.
      Your dealer techs should know where to look to perform this reset.
      Thanks. I appreciate how y'all know more than the dealer. It feels like they're going by process of elimination which is costly.

      Just one question, what is an ECM adaptation reset? I need so be super specific with these folks.

      THANK YOU. This has been maddening for weeks and your feedback give me some hope

    7. #5
      Junior Member Islay's Avatar
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      y'all were correct. IT was the front O2 sensor.

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