All BMW's have a carbon air filter and the 750 is no exception. They already replaced mine with a new one. They will replace yours too eventually and you should see it listed as one of the items on the work order. The cars computer system will tell them when it's time to replace it. If I'm not mistaken, there might even be an entry for it in the service screen in the iDrive system that will tell you when it should get replaced?!?
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2009 750i individual | Citrin Black Metallic | Platinum Merino Extended Leather | BMW Individual Composition Package (includes Sport Package) | Dynamic Handling Package | Multimedia Package | Technology Package | Executive Package
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