If your engine is smoking out the exhaust, and sucking oil into engine, which I had happen, it is usually a sign that the two CCV hoses which cross over the back of your engine over the intake tubes if engine cover is off on the 4.4 motor X5’s, squeeze hoses, if they are spongy, this is indicator they are restricted and when this happens they suck oil into engine cylinder, as crazy as that sounds, it happened to me. Left side exhaust only. I replace all components and hoses, never had an issue since with over 100K miles driven.
The warning for air suspension inactive is only able to be cleared by dealer or shop that has BMW diagnostics program. I have had my notice on for years, just ignore it, you always know when one of your air bags leak down, it is obvious, so who needs warning message.
For those who are changing alternator, it is not necessary to remove radiator as most DIY videos will instruct. It is a tight fit, but simply put cardboard protection against your radiator and you can wedge alternator up and out with no damage. It is a tight squeeze, but you can pull it out an put new one in without the extra wasted time pulling radiator out. I always look for short cuts on my vehicles when it comes to repairs.