See also:

Tire inflation pressures X5 xDrive50i with two rows of seats
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Low tire pressure message
The yellow warning lamp lights up. A Check Control message is displayed. There is a flat tire or a major loss in tire inflation pressure. The system was not reset after a wheel change ...

Maintenance
The battery is maintenance-free, i.e., the electrolyte will last for the life of the battery. Your service center will be glad to advise you on questions regarding the battery. ...