The charcoal canister is located on rear side of the passenger side front strut tower.  You'll see a black, plastic cylinder with two vacuum hoses attached at the top.

The charcoal canister is not a typical problem area for the car.  Just inspect the canister and attached vacuum hoses for cracks or leakage.  If you find damage to the charcoal canister, you need to replace it with another Mazda OEM unit.  Damaged vacuum hoses can be replaced with generic vacuum hoses from the local auto parts store.
Note:  There is a third vacuum hose attached to the charcoal canister underneath.

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