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International Automotive Technicians Network
Re: Mack MP7 Stuck in DEF Derate
Posted to HD/Fleet Forum on 1/23/2024

I appreciate your help guys. I was able to find a section in Tech Tool to reset the after treatment derate. I did check the DEF for quality, it was good. I believe the code was caused due to a NOX sensor test not completing all the way. Login to read more.