What's the BMW code cc id 166?

The cc id 166 code indicates Your BMW is experiencing low engine coolant levels.Seeing the Check Coolant Level warning on Your dashboard is often a sign You're about to have a very bad day. Your engine's coolant also known as antifreeze is a vital fluid that keeps the engine's temperature regulated, improving efficiency and preventing overheating that could damage the motor. If You do need to replace Your coolants or the coolant level sensor the average cost for coolant level sensor replacement is between $80 and $90. Labor costs are estimated between $40 and $50 while parts are priced at $40. This range does not include taxes and fees, and does not factor in Your unique location.