Reductant pressure in the SCR system
â–¶ How to fix
Check whether the ventilation valve is stuck open. Check the reductant hose for leaks.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The reductant pressure falls by more than 0.5 bar on start-up.
Possible cause
The ventilation valve is stuck open or there are leaks in the reductant hose