[DrD]

The light has come on twice in my 12 Legacy (the fluid is usually pretty close to full) - if you undo the plastic fittings and pull down the front of the drivers side mudguard, the bottom of the reservoir and the sensor are right there - each time I thumped the bottom of the reservoir a few times and unmated/remated the connector and the light went out. I figure the float is getting stuck or something.

Good to know that unplugging the sensor turns off the light... that might be a more appealing solution than spending $80 on a replacement when the sensor fails for good!