Liebherr Fault Code
Free · no signupP1189
Active Torque Derate / AdBlue Lamp
System
Emissions / SCR
Symptom
Active Torque Derate / AdBlue Lamp
Diagnosis & fix steps
LOGIC: SCR Aftertreatment Warning Level 3 (NOx Conversion Efficiency Below Critical Limit).
ACTION: Check DEF dosing nozzle for urea crystallization. Test DEF pump delivery pressure (~6 bar) and check downstream NOx sensor feedback using Liebherr SCULI diagnostics.
Red Seal field insights
Inducement Logic: Unaddressed Level 1/2 warnings trigger Level 3, capping engine torque at 50–75% and severely restricting rotary drive pull and Kelly bar speed.
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