I had a similar problem regarding my rear air suspension . I drive an 02 X5 3.0d euro version. I already changed the left rear air bag and thought it would solve the problem. However, I observed after one day overnight the rear left side was slowly sinking ( same air bag I replaced). Based on my research about this topic, I guess my next step is to check the sensors and fuse for possible replacement ???

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2002 E53 X5 3.0d SAV