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4364 Fmi 18 and Poor DEF Quality

Discussion in 'Freightliner Forum' started by lesvraissavent, Oct 28, 2022.

  1. Oct 28, 2022 #1
    lesvraissavent

    lesvraissavent Bobtail Member

    12
    1
    Dec 16, 2020
    Laredo
    0
    Got a code saying intake manifold pressure too high (overboost detected during regeneration) since then truck doesn’t ask for regen and now I get nox efficiency low and poor def quality every 10 days, I do manual regen and code goes away.


    Changed def filters about 2 years ago and truck did regen back then now it never asks for any regen.


    Any ideas?
     
    lesvraissavent, Oct 28, 2022
    lesvraissavent, Oct 28, 2022
    #1
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  3. Oct 30, 2022 #2
    Magoo1968

    Magoo1968 Road Train Member

    1,904
    4,997
    Mar 18, 2021
    St Malo mb
    0
    I used to get def quality code if I overfilled def by topping it up too much.. mechanic said when it clicks off don’t add anymore. My code was normally about a hour or two after filling it but would often go away before derate once I burned some def fluid off. 2015 paccar
     
    Magoo1968, Oct 30, 2022
    Magoo1968, Oct 30, 2022
    #2
  4. Nov 9, 2022 #3
    armo

    armo Light Load Member

    274
    289
    Jun 16, 2022
    0
    how do you know truck does regen or not ?:) maybe it regens while you driving it? :)
     
    armo, Nov 9, 2022
    armo, Nov 9, 2022
    #3
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