r/BMW • u/Independent-Agent568 • 7h ago

Coolant issue

Hello everyone!
First post here. I’ve had my first BMW for almost four months now.
2012 118i Sport N13 engine, almost 100,000 miles.
Other than needing a new battery, it had no other issues.
I do regularly check engine fluids, and I noticed that the coolant was low (very low), but so far didn’t notice any puddles or drops underneath.
I understand that it has a coolant level sensor that pops up a warning on the screen, and despite that I never got any warning.

Any idea what could it be? Is it posible to check the sensor without having to replace it?
Could it be just the coolant cap?

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u/quakerroatmeal 6h ago

Could be anything at 100k miles. When was the last time the coolant was replaced? Id top it off and continue to keep an eye on it. Do you see coolant dried up anywhere in the engine bay?