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2 mercedees emission code help

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by bowtieboy77, Nov 23, 2019.

  1. Nov 23, 2019 #1
    bowtieboy77

    bowtieboy77 Light Load Member

    274
    82
    Aug 16, 2013
    Southern, Ontario
    0
    Hello I have a 2008 sterling with a mercedees engine. I have 2 codes
    1. doser fuel line pressure failed self test spn 4077 fmi 135

    2. Dpf zone 2 condition spn3719 fmi135

    My assumption is a problem with the doser fuel supply has caused incomplete regens and is plugging the dpf.

    How do I check or diagnose the doser fuel line for issues? Is this a common problem on mercedees engines? I only have a prolink ultra which is very limited as to how much I can do. Any info as to how to diagnose and repair this issue is appreciated.
     
    bowtieboy77, Nov 23, 2019
    bowtieboy77, Nov 23, 2019
    #1
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  3. Nov 25, 2019 #2
    Working2party

    Working2party Medium Load Member

    608
    729
    Feb 10, 2018
    Kansas
    0
    Your correction your thinking, but Without the ability to run a forced parked Regen and watch the numbers, your only other choice is to start throwing parts. Your 2008 with codes like that, should be one of three things, wire harness, doser block/ doser injector, or doser fuel line leak.

    But without watching a regen your really just guessing.
     
    Working2party, Nov 25, 2019
    Working2party, Nov 25, 2019
    #2
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