The reasons why the forklift engine fault light is on are as follows:

1.发动机燃烧状态差是发动机故障灯亮的主要原因。在车辆设计中，为了保证发动机处于良好的工作状态，保证发动机的正常工作寿命，设计了氧传感器来监测发动机的燃烧状态，一旦发动机燃烧状态不好，如碳氢化合物气体含量过高、一氧化碳含量过高、氢氧化物含量过高，这些基本上是不良燃烧状态，不仅污染环境，还可能造成燃料浪费和发动机过度磨损。

1. The poor combustion state of the engine is the main reason why the engine fault light is on. In the vehicle design, in order to ensure that the engine is in good working condition and ensure the normal working life of the engine, an oxygen sensor is designed to monitor the combustion state of the engine. Once the combustion state of the engine is bad, such as high hydrocarbon gas content, high carbon monoxide content and high hydroxide content, these are basically bad combustion states, which not only pollute the environment, It may also cause fuel waste and excessive engine wear.

2.发动机气缸内部不干净。发动机内部肯定会积累一些部分。这些碳沉积本身会导致发动机设计参数的变化。同时，它们的性质不稳定，热量积累。这些碳沉积会导致发动机无序着火和爆震。这样，发动机故障灯就会亮起。

2. The interior of engine cylinder is not clean. There must be some accumulation inside the engine. These carbon deposits themselves will lead to changes in engine design parameters. At the same time, their properties are unstable and heat accumulation. These carbon deposits can lead to disorderly ignition and detonation of the engine. In this way, the engine fault light will come on.

3.燃油质量差的原因可以很好地识别，通常发生在刚加油或加油后的一段距离内。部分加油站提供的燃油不符合规定，油质不合格或混合不同类型的油，也会引起系统报警。

3. The causes of poor fuel quality can be well identified, which usually occurs just after refueling or within a certain distance after refueling. The fuel provided by some gas stations does not meet the requirements, the oil quality is unqualified or mixed with different types of oil, which will also cause the system alarm.

4.如果是内燃叉车，这是发动机故障指示灯，这意味着有故障，须立即停止，并根据故障表排除故障。如果是电动叉车。它是一个通信指示灯，只在灌装软件中亮起，通常不使用。亮时，电气控制通常有故障，操作不当，当电池功率低时，灯会亮起并闪烁。

4. If it is an internal combustion forklift, this is the engine fault indicator, which means that there is a fault, it must be stopped immediately and the fault shall be eliminated according to the fault table. If it is an electric forklift. It is a communication indicator that only lights up in the filling software and is usually not used. When on, the electrical control is usually faulty and misoperated. When the battery power is low, the lamp will light up and flash.

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