Why is the urea fault light on in a new car?
2 Answers
The urea fault light in a new car comes on due to reasons such as depleted urea solution, substandard urea quality, or blockage in the SCR system pipelines. Here are more details: 1. Specific solutions for urea faults: (1) If the vehicle exhibits symptoms like poor acceleration or white smoke from the exhaust pipe, professional equipment should be used to clean the urea crystallization inside the exhaust pipe. (2) If the vehicle's fault code indicates low urea pressure, the urea solution needs to be replenished. 2. Automobile urea: Automobile urea is a diesel exhaust fluid that uses SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxides in diesel vehicle emissions. If the automobile urea is missing or the SCR system malfunctions, the vehicle may show symptoms like poor acceleration, unresponsiveness to throttle, insufficient power, or inability to increase engine RPM.
I just dealt with this annoying issue recently - never ignore the urea warning light on a new car. Last time when I was driving on the highway, the light suddenly came on, which really made me nervous. At the 4S店, they plugged in the diagnostic computer and found it was a false alarm from the urea level sensor - new car sensors are overly sensitive and can trigger false alarms even from minor water splashes during urea refills. The mechanic told me this is the most common issue with China VI emission standard vehicles, usually caused by either poor-quality urea clogging the injector or loose wiring connections in the after-treatment system. By the way, those small jerrycans of automotive urea sold at gas stations may be cheap, but the quality is really subpar. I switched to big-brand barrel urea instead, and after driving a few dozen kilometers, the fault code cleared by itself.
