Why is the urea fault light of China V diesel vehicle always on?

[LeilaniDella]

The urea fault light of China V diesel vehicle is always on due to lack of urea or loose sensor connection. Here is more relevant information: 1. The role of urea in vehicles: Vehicle urea is a diesel exhaust fluid that uses SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxides in diesel vehicle exhaust. If the vehicle urea is missing or the SCR system malfunctions, the vehicle may exhibit symptoms such as weak acceleration, unresponsiveness to throttle, insufficient power, and inability to increase engine speed. 2. Specific solutions for urea faults: (1) If the vehicle shows symptoms of weak acceleration or white smoke from the exhaust pipe, professional equipment should be used to clean the urea crystallization in the exhaust pipe. (2) If the vehicle fault code indicates low urea pressure, urea should be replenished. (3) If the engine torque is limited and the speed cannot exceed 1800 rpm, the urea pump and sensor should be replaced.