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Old 11-27-2020, 07:49 AM   #1
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Def derate

Has anyone else experience a def derate on their frieghtliner with the cummins engine
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Old 11-27-2020, 09:02 AM   #2
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2018.5 Seneca (S2RV Chassis)-DEF light & check engine light came on w/3 DEF squares lit. As instructed by Freightliner pulled into Odessa Freightliner & “DEF Header” was replaced. They had part in stock & mechanic said it was a common problem. Drove it 150 mi. when this occurred never did go to derate. Drove several thousand miles after DEF Header was replaced. No problem.
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Old 11-27-2020, 10:26 AM   #3
Drv
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Pretty Good discussion in this Link.
Mine is going in soon to check hose routing and check of Def Header.
Hope this helps!
https://www.jaycoowners.com/forums/f...des-78302.html
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Old 11-27-2020, 04:31 PM   #4
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Thanks
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