Mazda CX-3 Tail Light Bulb Size

The Mazda CX-3 tail light requires a 7443 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the range from 2016 through 2021.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2021	7443
2016-2019	7443 (With Halogen Capsule Headlamps)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T20). 12V, 21W/5W.	7443

Other Locations

Additional Notes

The 7443 is the sole tail light bulb size listed across all model years of the Mazda CX-3 covered in these specifications.
The 7443 bulb follows the ANSI standard recognized in the United States and Canada, classifying it as a regionally standardized automotive bulb.
It belongs to the T20 wedge bulb family, a form factor defined by its wedge-shaped base, which seats directly into a compatible socket without a separate bayonet or pin mechanism.
The 7443 operates on a 12-volt electrical system, consistent with standard automotive DC voltage found in passenger vehicles.
As a dual-filament bulb, the 7443 carries two separate filaments rated at 21 watts and 5 watts, allowing it to serve both a brighter stop-light function and a dimmer running-light function within a single housing.
For the 2016-2019 Mazda CX-3, the 7443 fitment is conditional, applying specifically to vehicles equipped with Halogen Capsule Headlamps.
The 2021 Mazda CX-3 lists the 7443 without a headlamp-type condition, indicating the specification applies regardless of headlamp configuration for that year.
The conditional fitment noted for 2016-2019 models signals that vehicles from those years with a different headlamp configuration may not share the same tail light bulb requirement, making headlamp type a relevant factor before installation.