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.
I purchased the Amazon one (KD45-61-J6X) for my '15 and it's worked well.
Not nearly as bad as some of the others listed here, but absurd for what it is: cabin air filter for a first-gen Mazda3.
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.
Cabin air filter, first gen Mazda 3. Getting to the filter is a pain.
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