I just fixed this problem two weekends ago.
I did a complete coolant hose/waterpump job in December. And like many suggest, I also purchased a new Expansion tank.
From day one, I was getting this error. I checked the wiring over and over. I tried burping, and setting the water levels high and low, I changed the sensor twice.
Recently, I started leaking coolant out of the lower connector to the EX-Tank. I decided to get a new hose and another expansion tank. The leak went away and the low coolant level warnings did too. Bad tank.
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2006 X5 Sport 4.4i
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