I called the MB dealer about the A2 service warning displayed on the dash. The dealer said it was routine maintenance but would change the air and cabin filters if necessary. They seriously said that replacing the air or cabin filter would cost about $125! (2010 C300) Go online and you'll see some home videos on where and how to replace them. Please note this is a set of 2 filters and you will need both. Some of the lists for this filter are really ambiguous as to whether it's one sentence, two, or not, so read it carefully. What is confusing is that there is a row of activated carbon filters directly above these filters. Most videos don't show these special filters and I can't find them for sale. By the way, the cabin air filter is a completely different problem. The swap doesn't require a mechanic or special tools, but it helps if you're an acrobat, slim and have a lot of patience - all qualities I lack. Search the Internet for a video on how to change the cabin air filter. I don't think MB "looks" at the cabin filter and ever finds that it doesn't need to be replaced after they pull it out.
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