This function indicates that the NOx conversion efficiency is not correct
Conditions for diagnostic trouble code (DTC):
1) Too high NOx emissions
Observable symptoms
1) Possible engine de-rate
Probable cause
1) Charge air system
2) EGR Mass Flow
3) Diluted, wrong or contaminated Aftertreatment Diesel Exhaust Fluid (DEF) in Aftertreatment diesel exhaust fluid (DEF) tank
4) Aftertreatment Hydrocarbon Doser, over-fueling
5) Fuel Injection System Over-Fueling
6) Aftertreatment selective catalytic reduction (SCR) system Dosing too low
7) Insufficient Aftertreatment Diesel Exhaust Fluid (DEF) supply to Aftertreatment Diesel Exhaust Fluid (DEF) Pump
8) SCR Catalyst
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