CEL after NOX sensor replacement

Discussion in 'Volvo Forum' started by 86scotty, Jan 27, 2020.

  1. 86scotty

    86scotty Road Train Member

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    2015 D13, 750k

    I got a CEL a couple weeks back. NOX sensor (pic below)

    I was on the road so I reset it a few times with the OTR reset tool. It would stay off for a day or so then come back on. Same code.

    This weekend I replaced the inlet NOX sensor and had DPF and DOC cleaned as well. I did not go to a Volvo dealer for this.

    After replacement my CEL is still on but no longer shows any faults. My reset tool will no longer turn the CEL off. I checked all modules, no active faults anywhere.

    Will it eventually go off or does it have a hard code locked up in it somewhere that I can’t see without dealer software?

    Bellow is the original DTC. to be clear, it is now cleared but CEL is still on.
     

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  3. Sharky88

    Sharky88 Heavy Load Member

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    Normally it will reset on its own if no active faults
     
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  4. 86scotty

    86scotty Road Train Member

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    Ding ding ding! You are correct, sir, thanks! About halfway through my 400 mile run today it turned itself off. I guess now I know.
     
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  5. shatteredsquare

    shatteredsquare Road Train Member

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  6. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Yes it will cause a derate. Consider yourself fortunate that your truck showed an issue that wants to be addressed before it gets worse. Take care of it. Now.
     
  7. shatteredsquare

    shatteredsquare Road Train Member

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    ah yes, imminent doom. right on schedule
     
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  8. shatteredsquare

    shatteredsquare Road Train Member

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    5 month update, code still there. me and orange light we're having a starring contest. no lie got 9.4 mpg pulling 79k gross from Wyandotte MI to St Louis MO at about ~65 degrees F ambient, cruise on 60 mph
     
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