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What is the function of automotive urea?

2 Answers

Shirley

07/24/25 12:41am

The function of automotive urea is to convert nitrogen oxides in vehicle exhaust into harmless nitrogen and water, enabling the vehicle to meet the national emission standards. The impacts of not using urea in vehicles include: 1. Exceeding emission limits, causing environmental pollution; 2. Oxidation of chemicals in the vehicle system, leading to clogging of the urea nozzle and rendering the entire system unusable; 3. Reduced vehicle power. The roles of urea are: treating exhaust to reduce pollutants, optimizing engine performance, and improving fuel consumption. Methods to eliminate the urea warning light include: 1. Replacing the urea solution; 2. Replacing the water heating valve; 3. Replacing the urea pump and power supply module connector. Reasons for the urea warning light include: 1. Low urea pressure, high urea consumption; 2. Insufficient power, excessively high or low urea consumption; 3. Instrument panel malfunction.

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McBentley

08/10/25 8:22pm

This thing is an eco-essential for diesel vehicles! It's primarily used in SCR systems to specifically tackle nitrogen oxides in exhaust. After you pour it into the urea tank, it turns into ammonia under the high temperatures in the exhaust pipe, then chemically reacts with those harmful nitrogen oxides in the exhaust, ultimately converting them into harmless nitrogen and water vapor. If you skip the urea, not only will your vehicle lose power due to torque limitation, but pollution levels will skyrocket. Nowadays, China VI-compliant vehicles are mandated to have this system—without urea, exhaust simply can't meet emission standards. Regularly topping up with high-quality urea also protects your vehicle's aftertreatment system.

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