In a VW Polo the oil indicator is turned on

Derrepente sounds a whistle 3 times and the oil light is turned on on the dashboard of a VW Polo, could someone help me with this topic? ..... Thank you.

The same thing happened to me in a 1.4 pole of 97, it turns out to look at the level and well, mediate the pressure and well; I thought "the pressure sensor was damaged," I changed it and .. I followed the same with the beep and the light, wondering that it was a failure that the Ecu brought from programming and such ... that it would change this ... "ok"; Remove the picture and cancel the buzzer and light, so without any problem (from 2002 to this day). Don't worry but make sure the pressure. Greetings!!