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My Ride: 2010 535xiT Touring, N54, Individual Audio
Model Year: 2010
Engine: N54 3.0L Twin Turbo
Is one side sitting lower than the other in the morning? You probably have a slow leak in the system somewhere, your airbags look original - it could be one of the bags has a slow leak and is on its way out. They are pretty simple to replace. In my case - I had a air bag blow out on the highway - lost all the air in a matter of seconds, and the compressor wasn't able to keep the system pressurized, so I drove home on a flat suspension.