The Mazda CX-9 tail light requires a bulb size of 7443 for the specific lighting component located at the rear of the vehicle. Data for the bulb specifications covers the range from 2015 to 2017.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7443 bulb is the most widely used type across the Mazda CX-9 tail light specifications, appearing in both the outer tail light positions across multiple model years.
The 7443 is an ANSI-standard dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W/5W output, where the two wattage values correspond to its two separate filaments, typically serving stop and tail light functions within a single housing.
The Mazda CX-9 outer tail light uses the 7443 bulb for the 2013-2017 model years.
The inner tail light of the 2013-2015 CX-9 uses the 12961, a Philips-designated miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, rated at 12V and 5W.
The 194 and 12961 are both T10 miniature wedge bulbs, but they are not interchangeable without verification, as they differ in wattage ratings (3.78W versus 5W) and designation standards (ANSI versus Philips part numbering).
The inner tail light of the 2007-2009 CX-9 uses the 194, an ANSI-standard T10 miniature wedge bulb rated at 12V and 3.78W.
The T20 form factor of the 7443 is physically larger than the T10 form factor shared by the 194 and 12961, making cross-substitution between outer and inner tail light positions mechanically incompatible.
The 7443 and 194 carry ANSI designations, meaning their specifications are standardized across manufacturers, while the 12961 is a Philips-specific part number referencing a bulb built to Philips tolerances.