Skoda Haorui car engine fault light is on. What's wrong with checking whether the oil is thin?

The main reason why the engine fault light is on is that the throttle or the engine has too much carbon deposit, which leads to the imbalance of the mixture ratio and is easy to cause the engine fault light to be on. If your car is driving at a low speed in the urban area for a long time, it is easy to appear this phenomenon; If you often shift to a high gear when the engine is at a low speed, this phenomenon will also occur.