Little help looking at this DEF injector lite on service DEF system see dealer?

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TC Diesel

Well-Known Member
Supporting Member
Jul 14, 2016
Truck Year
Very common if you have 2014-17 mix Your DEF with 2.5 Gallons and 1 Gallon Distilled water Problem solved.

DEF is 33% Urea and 67% Deionized water.

Have been running 10-15% Urea in all My DEF Vehicles for 12 Years.