Hi, I have just replaced the coolant tank on the wife's 2001 3.0p x5 because the old one was loosing coolant because of a crack. now every time I turn the key on or off I get this message "check coolant level".

I have checked the coolant level and the stick pops up fine, so I'm confused?

O i also let the car warm up also undid the bleeding screw for a few mins.

I'm thinking maybe I broke a sensor or something as prior to the tank change the message only flashed up when it was actually low

Many thanks kind regards jon