might be a loose connection or faulty water level sensor or it could be the dreaded wiring harness, I would definately keep an eye on the water level, sometimes justa little less water than normal can set it off. Top it up witht he car running and see if that helps...

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U