Medium and Heavy Trucks
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ECM SPN 4094, NOx Limits Exceeded Due to Insufficient Diesel ExhaustFluid (DEF) Quality – MID 128 PSID 90
• DEF quality• Aftertreatment DEF line clogged• Aftertreatment DEF doser• Aftertreatment control module failure
ECM SPN 5246, Aftertreatment SCR Operator Inducement Severity – MID128 PSID 46
This fault is related to the 4094 just indicating that the engine has been derated. Repair the 4094 fault and this fault will be resolved with it