What is the reason why the 430 engine fault light of China National Heavy Duty Truck Hao Han Natural Gas Company is not on?

If the engine fault light is on, the car itself does not cause collision, which is generally a phenomenon that is easy to occur when driving at low speed in urban areas for a long time.

The reasons are as follows: 1. Too much carbon deposit in throttle or engine. 2. When the oxygen sensor fails, the mixing ratio is unbalanced. If you drive at a low speed in the urban area for a long time, it is easy to appear this phenomenon. 3. The nozzle leaks air, which leads to the nozzle still being in the oil supply state after the throttle valve is closed, which leads to the excessive mixture when driving at low speed, which leads to the unstable idle speed after the oil is closed. If it is serious, turn it off directly. 4. The oxygen sensor was poisoned by adding inferior gasoline with excessive metal content. The solution is to change to a gas station.