Cabin air filter - I believe that’s recommended every 12k miles or so. I always replace mine annually. Part number KD45-61-J6X-9U.
I've purchased these and they fit well. Much cheaper than letting the dealer do it.
Same issue in my 2019 M3. Replace the cabin air filter. Solved.
I purchased the Amazon one (KD45-61-J6X) for my '15 and it's worked well.
When I started dating my wife, I found out she was on the original cabin air filter in her car. Surprisingly the cabin air filter was relatively clean and looked nothing like the picture posted.
Unnecessary. A few years ago a Mazda dealership suggested a bunch of work to me when I went in for an oil change, including some stuff I had done on my own literally a week before. I got a survey from Mazda and complained on it that they were suggesting bogus things that I know for a fact did not need to be done (e.g. they claimed my cabin air filter and engine air filter were dirty, despite being brand new).
Cabin air filter, first gen Mazda 3. Getting to the filter is a pain.
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