Does Not Adding Urea Affect the Car?

2 Answers
AlexandraLee
07/24/25 4:23am
Not adding urea has a certain degree of impact on the car. Here is an introduction to automotive urea: 1. Introduction to automotive urea: Automotive urea is a liquid used in SCR technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. Its composition is 32.5% high-purity urea and 67.5% deionized water. 2. Definition of automotive urea: It is applied in diesel engines. It is a liquid used in SCR technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. Its composition is 32.5% high-purity urea and 67.5% deionized water.
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StSkylar
08/11/25 12:00am
Recently, I went on a long-distance trip and noticed that my car's fuel consumption suddenly increased, and the power was noticeably insufficient. After inspection, I found it was due to not adding urea. My experience is that for diesel vehicles, if you don't add urea, the post-processing system will trigger an alarm, and the dashboard will show a fault light. If left unaddressed, the vehicle will automatically enter a torque limitation mode, which restricts engine power, making the car feel sluggish and struggle even when climbing hills. Prolonged operation in this state may damage the catalytic converter or the particulate filter, and repairing these components can be very expensive, ranging from several thousand to tens of thousands of yuan. Additionally, emissions will exceed standards, potentially causing the vehicle to fail the annual inspection. My suggestion is to add urea every time you refuel to avoid major issues.
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