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Engine air filter is not a separate CBS item, it is changed during the main service inspection which I believe is every 30,000.
30 minute DIY for the air filter:
http://www.e90post.com/forums/showthread.php?t=4101
Clean the MAF sensor when you change the air filter, it is documented in that thread as the MAF sensor is in the air filter plastics; kill two birds with one stone.
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