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The error code 166 on your BMW signifies that the engine coolant levels are low. When you see the warning "Check Coolant Level" on your dashboard, it's a clear indication that you may encounter some issues soon. Engine coolant, also referred to as antifreeze, is a crucial fluid that helps in maintaining the engine's temperature, enhancing efficiency, and preventing overheating that could potentially cause damage. If you need to replace your coolant or the coolant level sensor, the approximate cost for the sensor replacement ranges from $80 to $90. Labor costs are estimated to be between $40 and $50, while parts are priced at $40. Keep in mind that these figures do not include taxes and fees, and may vary based on your specific location.
The error code 166 on your BMW means that the car's coolant levels are too low.
Low coolant level
Is error code 166 causing my thermostat to malfunction as well?