What is the reason why a China V vehicle does not consume urea solution?

[LukeLynn]

The reason why a China V vehicle does not consume urea solution is that the urea nozzle is clogged. It is necessary to check whether the urea nozzle is crystallized and blocked, and whether the control unit is not supplying power to control the nozzle. More information about automotive urea solution is as follows: 1. The scientific name of automotive urea solution is Diesel Exhaust Fluid (DEF). It is used in diesel engines and is a liquid applied in SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. 2. Its composition consists of 32.5% high-purity urea and 67.5% deionized water. Although automotive urea is also urea, it is vastly different from agricultural urea. Automotive urea has strict ratio requirements, essentially composed of high-purity urea and deionized water, with the proportion strictly controlled. One of the standards for quality is the degree of impurity control. Agricultural urea contains more particles, metal ions, minerals, and other impurities, which are very harmful. Extended information: The China V Motor Vehicle Pollutant Emission Standard, also known as the 'China V Standard,' has an emission control level equivalent to the European Euro 5 emission standard currently in effect. From China I to China IV, each upgrade in the standard reduces single-vehicle pollution by 30% to 50%.

[DelJosie]

I've been driving diesel vehicles for over a decade and often encounter issues with AdBlue not being consumed in China V emission standard vehicles. The most common problem is a malfunction in the urea injection system, such as a clogged nozzle—usually caused by using inferior quality urea—or a faulty injection pump that can't spray the liquid. Another scenario is a defective temperature sensor; during winter, it mistakenly thinks the urea might freeze and shuts down the system. For troubleshooting: first visually check if the AdBlue tank is empty. If it's full but the dashboard warning light is on, it indicates a faulty sensor or loose wiring—take it to a professional auto repair shop to scan the diagnostic trouble codes. If left unaddressed, the vehicle will fail annual emissions tests due to exceeding standards, waste fuel unnecessarily, and increase exhaust pollution. Simple self-maintenance tips: regularly replace with genuine AdBlue, clean the nozzles, and avoid using cheap fluids.

[DelPenelope]

I just bought this new car and it wasn’t consuming urea fluid for the past two days, which scared me into thinking the car was broken. I asked a car-savvy friend, and he said this issue is quite common in China V diesel vehicles—sometimes it’s not that the urea isn’t being consumed, but the system is stuck and hasn’t activated. For example, if the weather is too cold and the urea freezes, the car automatically pauses the system; or after a software update, it might not reset properly. He suggested turning off the engine, waiting a few minutes, and restarting it. If that doesn’t work, check the user manual for the fault light’s meaning. If the fluid level is normal but the light is on, don’t try to fix it yourself to avoid damaging the connectors—just take it to a 4S shop for a diagnostic test. For daily use, opt for mid-priced urea to prevent freezing—it’s safe and hassle-free. Don’t ignore this issue, as failing emissions tests could lead to fines and harm the environment.

[DaniellaLynn]

I've handled many similar cases where the key issue of a China V vehicle not consuming urea lies in SCR system malfunctions. The most common problem is carbon buildup clogging the injector nozzle, where dirt accumulation affects injection. Alternatively, a faulty level sensor might misread as empty, causing the control unit to stop operation when receiving no signal. Another possibility is aged or broken wiring preventing current transmission. During inspection, remove the injector to check for cleanliness - having diagnostic tools to read fault codes is even better. For prevention, use standard-compliant urea to avoid crystallization and clean the system every 10,000 km. Don't underestimate this issue, as it can cause engine emissions to exceed standards and accelerate long-term wear.