Nox Sensor issues (Freightliner DD13)

Discussion in 'Freightliner Forum' started by jdpromo33, Nov 3, 2019.

  1. mhyn

    mhyn Road Train Member

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    ok. I guess your second code was high doc inlet pressure. Do these.
    a. Remove flex exhaust pipe between engine and 1-box. Check to see there is excessive soot on pipe wall. These must be little soot on walls. Start the engine and let it idle(coolant temp must be higher than 150f). Get helper and ask him to see how much black smoke is coming out from that pipe when you push the acceleration pedal quick. Football ball size of black smoke must come out and stop. If you see not a lot black smoke is coming out connect back that flex pipe.
    b. remove dpfs and clean yourself by hot water. Youtube has videos. Or buy reman dpfs and install.
    Nox sensor issue has no connection with this issue... Fix Nox sensor problem.
     
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  3. JonJon78

    JonJon78 Road Train Member

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    Just out of curiosity do you have APU on that truck?
     
  4. jdpromo33

    jdpromo33 Bobtail Member

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    So if there’s a lot of black smoke I do part B? And is there a likelihood that the box sensor is bad and it’s sending wrong message to the trucks computer?
     
  5. jdpromo33

    jdpromo33 Bobtail Member

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    No APU
     
  6. JonJon78

    JonJon78 Road Train Member

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    Do you idle a lot?
     
  7. jdpromo33

    jdpromo33 Bobtail Member

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    No actually I don’t.
     
  8. mhyn

    mhyn Road Train Member

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    b. a lot of black smoke
    bad injector, cracked cac, leaking intake manifold, ...
    there is no such a sensor
     
    Last edited: Nov 4, 2019
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  9. jdpromo33

    jdpromo33 Bobtail Member

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    Ok thank you for the help.
     
    mhyn Thanks this.
  10. mhyn

    mhyn Road Train Member

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    you are welcome.
     
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