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SCR problem


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SCR derate keeps returning even after crystal sublimation and regen NOx sensor codes even after replacing and reagent dosing valve code using tech tool vcads pro guided diagnostics several 2012 mack in my fleet mack house backed up for months help please some one really familiar with program much appreciated!

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On a few truck trucks, even after replacing both nox sensors and doing 2 back to back regens and watching the NOX levels drop, the codes still show active. We have been able to then clear the codes and do 3 short test drives and codes never comee back. Mack had a SPN-5394 FMI-17 / SPN-4094 FMI-18 check sheet but its not on the Mack dealerportal anymore, they say they put the steps in Guided Diagnostics

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  • 3 weeks later...

Blue switch, top row, 2nd from the left. Down is off, middle. is auto, up is forced. 125000km (no idea on hrs....should check) on my 2011 MP7 and only twice has it told me to regen

Lack of planning on your part does not constitute an emergency on my part....

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