oil level low is not a fault code,so you can not remove it..if it is on because either the oil level is low ,the sensor needs recalibrating ,or more likely the sensor needs replacing ,i have never known the wiring for the sensor to fail ....by the way it is plugged in to the bottom of the sump...haven't a clue why you where told to unplug the dash ,that makes no sense what so ever ...
norb
February 2012