Fault Phenomenon: Hangcha X series diesel forklift instrument displays a urea system fault, engine torque is limited, power drops.

Troubleshooting Process:
– Checked urea level: level sufficient.
– Checked urea quality: concentration unqualified.
– Checked nozzle: nozzle crystallized and clogged.
– Checked NOx sensor: sensor data abnormal.

Root Cause: Clogged urea nozzle due to crystallization or poor urea quality causes system error.

Required Parts: Urea nozzle assembly and qualified urea solution.