When a car has air suspension, it means that the car's suspension system is partially or entirely supported by air pressure. Air suspension systems are often used in luxury vehicles because they provide a smoother ride than traditional suspension systems. However, if the message air suspension off appears on the dash, it indicates that there is a problem with the system and it is not functioning properly.
There are several reasons why the message air suspension off may appear on your dash. One possibility is that there is a leak in one of the air bags. This can cause the bag to deflate, which will make your ride less comfortable and may even damage your tires. Another possibility is that the compressor, which pumps air into the bags, is not working correctly. This can be caused by a variety of issues, such as a blown fuse or low voltage from the battery. If you see this message on your dash, you should take your car to a mechanic to have it checked out as soon as possible.