尿素箱有液位温度传感器总成在尿素箱内部；常见故障有液位显示不准确、温度显示不准确、经常灯亮报液位传感器故障等等。（传感器容易出故障）
引起故障的原因：
1、本身传感器损坏
2、传感器接插件虚接、短路
3、限速本身故障
4、液位温度传感器与主机厂家参数不匹配，造成液位温度异常，甚至报传感器本身故障，其实是由匹配问题引起的（不常见）
尿素液位传感器电压高于上限或低于下限，PUE GK出现这个故障的故障现象是故障灯亮（obd灯亮）
可能引起的原因：
1、尿素传感器的接插件和整车限速之间的接头里面的接插针给虚接了。
2、尿素液位限速本身开路了。
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