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International Automotive Technicians Network
Re: Mack MP7 Stuck in DEF Derate
Posted to HD/Fleet Forum on 1/16/2024

Are you using Volvo/Mack Techtool? There should be a screen somwhere in Tech Tool that shows SCR efficiency etc. 4 different tabs i think. I think 1 of them resets the derate.

It's a good idea to clean the fuel doser nozzle, they get carboned up. It's a spray... Login to read more.