4421 SPN Fault Code


Aftertreatment 2 Diesel Exhaust Fluid Concentration


A measure of the concentration of urea in water. Zero percent means that the tank contains no urea. A 32.5% value indicates that the reagent is of the proper concentration. The 32.5% value indicates that the concentration is highest quality.Parameter Specific Indicator: A value of FBh indicates conditions are not acceptable for a valid measurement.

4421 spn fault code name is Aftertreatment 2 Diesel Exhaust Fluid Concentration. If you don't take the time to look into 4421 spn fault when it arises, it can add up quickly. One small issue like 4421 can cause a larger component to become damaged without taking the time to investigate. If you suspect your truck is suffering from one of these issues, look into replacing those small components to save money down the road.

Note: The name and description of 4421 code represents text descriptions for faults supported by another coding system and does not necessarily comply with SAE J1939. For a specific engine manufacturer's explanation for codes, please consult the engine's technical manual. See also other spn codes.

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