Oh sorry I mostly work on e53. They have a float for min/max.

Either way the low coolant will be for far far lower than min. Usually if you have erroneous low coldness l coolant is when the sensor connector is broken or a wire is broken.

On e53 I think the sensor can be pulled out of the bottom. It goes up inisde a sealed port so there is no seal to leak

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)