When it’s time to change the cabin air filter in your 5th Generation Honda Odyssey (years 2018-2024), the Maintenance Minder will alert you with a maintenance sub code of 2. In my case, I had a B12 show up on my instrument cluster, which means that I’m due for an oil change and inspection (B), along with an engine air filter (1) and cabin air filter replacement. For more detailed information on what the various codes mean and how to reset the Maintenance Minder System when you’ve completed your service, check out this post.