NOx Exceedence - Interruption of Reagent Dosing Activity

Check these first

• A DEF dosing system that stopped injecting reagent
• A clogged or failed DEF injector
• A DEF pump or heater fault interrupting dosing
• A NOx sensor reading that forced the dosing off

What to do next

1. Scan all modules and review the reagent dosing data and NOx readings
2. Check the DEF level and quality in the tank
3. Inspect the DEF injector for clogging or crystallization
4. Test the DEF pump pressure and dosing command
5. Replace the DEF injector or pump if dosing cannot be restored
6. Clear the code and retest

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