How to troubleshoot my Audi A5's coolant level sensor malfunction?

My Audi A5's dashboard has been displaying an error message about the coolant level sensor. How can I diagnose and fix this problem?

First, check your coolant level and ensure it is at the appropriate level. If it is low, fill it to the correct level and see if the error message goes away.

If the coolant level is fine, the next step would be to check the connections to the coolant level sensor. Make sure they are secure and clean. Sometimes, a loose connection can cause the sensor to malfunction.