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’ve had good results with FRAM fresh breeze cabin air filters. They block out quite a bit of exterior smells.
I have been a fan of the Fram Freshbreeze or Pureflow filters. Not as good as the Bosch HEPA for other cars, but seem pretty good at least for filtering allergens and some particulates.
Can confirm I bought the CF11811 for my 2018 and it was the correct size!
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.
Just remember, you get what you pay for. I don't recommend buying aftermarket filters on Amazon or eBay even if it is the OEM or a name brand. The quality is spotty at best and some of the reportedly "OEM" and brand name items are likely counterfeit. I've bought some really sketchy filters from Amazon and eBay that made my 18 Elantra's AC sound like an airplane especially when on low settings. The Amazon one came with thousands of positive reviews and the eBay one claimed to be OEM, but both suffered the same problem. I swapped the last one out with FRAM cabin air filter from Advance Auto Parts and no more jet engine sound.
Cabin air filter, first gen Mazda 3. Getting to the filter is a pain.
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