What is the reason for the absence of urea reflux sound after engine shutdown?

1 Answers
VanAliyah
07/29/25 4:43pm
After engine shutdown, the absence of urea reflux sound may be caused by a malfunction in the urea recovery device, and it should be inspected and repaired at a 4S shop as soon as possible. Below is relevant information about automotive urea: 1. The role of automotive urea: Generally, adding urea to vehicles is primarily to reduce exhaust emissions, as diesel engine exhaust mainly consists of nitrogen oxides and carbon particles. 2. National regulations: Because vehicle exhaust emissions pose significant harm to both people and the environment. Therefore, the National IV standard implemented in 2008 in China stipulates that diesel vehicles must use automotive urea in their emission reduction systems.
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