What does the fuel filter warning mean?

[DiOlive]

The fuel filter warning is an alarm signal unique to diesel vehicles, indicating that the diesel fuel-water separator needs to be drained. Otherwise, it may cause the engine to stall, rendering the diesel vehicle unable to operate normally. Although the fuel tank is sealed, water ingress is inevitable due to heavy rain or other reasons. If not addressed, this can significantly impact the car's engine. Diesel vehicles use a diesel fuel-water separator primarily to remove excess water from the fuel tank. When there is too much water, the fuel filter warning is triggered, alerting the driver to drain the water.