The causes of the "Urea Failure" light in a VPI 5 vehicle: Urea level sensor - The sensor may display inaccurate information, and some people have reported that their engine burns urea despite the fact that the solution level is always displayed as 100%. Urea pump - This cannot be self-diagnosed and requires a computer to check. Common故障码 is P020D, indicating low pressure in the urea pump. Urea喷嘴 - The喷嘴 is prone to clogging, but if the internal solenoid or short circuit is damaged, it can be observed that the喷嘴 and the exhaust gas contact with sparks.

To solve the problem of the "Urea Failure" light, it is necessary to check the urea level sensor, urea pump, and urea喷嘴. The urea level sensor may display an inaccurate level, which may indicate that the engine is burning urea. The urea pump may have low pressure and may need to be replaced. The urea喷嘴 may be clogged or have an internal solenoid or short circuit, which can be checked by observing the sparks when the喷嘴 and the exhaust gas contact. It is important to note that these causes are not mutually exclusive, and multiple factors may contribute to the light being亮.

In summary, the "Urea Failure" light can be caused by several factors, including the urea level sensor, urea pump, and urea喷嘴. It is important to diagnose and identify the exact cause to ensure that the vehicle is functioning correctly.