The past few mornings, I have noticed that my front passenger side is sagging. A few seconds after unlocking the car, the front passenger side will inflate and raise. Is the sagging likely due to a leaky air bag, or air strut? I don't know the difference. Thanks for your help.

2005 BMX X5 4.8is

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2005 e53 X5 4.8is (2/05 build date) Titanium Silver exterior/Schwarz (black) interior