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While in you're in that engine, replace the valve stem seals, it would suck if you got running good only to find out you have clouds of smoke coming out the exhaust. As for the air suspension, if only you had a good diagnostic tool like a snap on or autel maxisys but those are pricey. First thing I always do is hook it up to the scanner check the codes and then force the compressor to run to see if it works. If it doesn't it's burned and you need a new compressor, if it does then you know the compressor works and you have some other issue. Could be lucky and just do a reset of the system or it could possibly be the module. If it does run check for leaks in the hoses, bags, and the aluminum air storage container. Fortunately the rear bags are cheap, aftermarket from eBay starting at around 55 bucks or so. I would go with arnott rather than genuine Bmw. The front ones are more pricey. Anyways good luck with that and let us know with any questions, I've fixed a lot of X5 air suspensions both 2 axle and single axle. They are by far ALOT easier than benz suspension.
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