Bought a brand new 2021 Mazda 3 hatchback with very loud passenger dashboard rattle. Have this same issue on your 2019-2021 Mazda 3? Many do and this seems to be a problem spanning years for people. Here’s the fix:
The source of the rattle is the PLASTIC CASE AROUND THE AIRBAG INFLATOR. This can be fixed by adding a large amount of foam tape/insulation around the plastic case and then test driving and applying more as needed. This was performed by my service department during a ride along where it was confirmed to be the plastic casing - the technician pressed on it, hand inside dashboard through glovebox - once pressed, the rattle stops.
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