What is the NCD light in China VI vehicles?

[VonZoey]

The illumination of the NCD indicator light in China VI vehicles means that the urea solution level is below 10%, and urea needs to be added as soon as possible. Below are the specific details about automotive urea: 1. Principle: The main harmful substances in exhaust are nitrogen oxides and particulates. Technical means can reduce particulate emissions inside the engine, leaving mainly nitrogen oxides in the exhaust. Urea is injected into the exhaust after-treatment device, where it decomposes into ammonia at high temperatures. Under the action of a catalyst, the ammonia reacts with nitrogen oxides to produce harmless nitrogen and water. This device is called the SCR after-treatment system. 2. Urea consumption: Vehicles have a dedicated urea tank, and urea is consumed as long as the vehicle is running, so it must be replenished promptly. Generally, about 4 liters of urea are consumed per 100 liters of diesel. The exact amount depends on factors such as engine displacement, model, manufacturer, etc. Different road conditions and loads can also affect urea consumption.