Volvo SPN 4094 FMI 1 Nox Limits Exceed Due To insufficient Regent Quality

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This code indicate that NOx Conversion efficiency Is not Corrected

Symptoms
Engine De rated

Problem Cause

Dosing too low
DEF tank have wrong liquid
Faulty ACM
DEF doser Vale have issue and not working
Hydrocarbon 7th Injector Over Fueling
DEF Pump Filter Stuck
SCR Catalyst Reduction

Some helpfull Repair checks

Check the sensor port and Venturi tube blockage
Check Venturi tube sensor O rings are not damaged
Check DEF fluied is mixed with other fluid like oil,diesel,coolant etc
Check DEF dosing Valve have no fault,crack or cut at the place of dosing vale
Check DEF Pump Filter not blocked
Check 7th Injector fuel line not blocked
Clean 7th Injector
 
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