the oil-water alarm light icon is similar, and the separator separates water droplets. When the warning light of the oil-water separator is on, it means that the oil-water separator has stopped running due to a fault, prompting the owner to stop for maintenance. When the oil-water separator fails, the normal water removal step cannot be carried out when the automobile fuel is burning. Failure of oil-water separator will easily lead to abnormal operation of fuel injector, which will lead to unstable acceleration, weak acceleration and black smoke. The engine emits white smoke; Serious carbon deposition, etc. The specific reasons of the water separator are as follows: 1. Shiny state: The oil-water separator cannot operate normally due to too much water in the fuel filter. 2. Normally-on state: the relevant sensors that make up the oil-water separator have failed, so they can't transmit the working state normally and stop running.