How long does it take to check the yellow light of Mercedes B200 engine?

Well, it depends. It's estimated that the throttle is dirty. Just clean it. As long as 4S is connected to the computer, we can immediately know what is wrong. Generally, the yellow light is the throttle, or the exhaust gas is not good. Imported cars may be more expensive in terms of environmental protection requirements. In addition, the sensor is sensitive. My B200 turned yellow only a few hundred kilometers ago. Later, I went to 4S and said it was sensitive to sensors. Actually, the throttle is not that dirty. Just help me remove the fault code.