The Acura TSX tail light utilizes 7443 and 168 bulb sizes for the rear lighting assembly. Available information covers the specific time period from 2004 through 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura TSX tail light assembly is divided into two sections across its model years: an inner tail light position and an outer tail light position, each requiring a distinct bulb type.
The inner tail light on the Acura TSX uses the 168 bulb across the 2004-2008 model years. This is an ANSI-standard miniature wedge bulb in a T10 form factor, rated at 12V and 4.9W.
The T10 wedge base is a common fitment in low-intensity automotive lighting positions. At 4.9W, the 168 bulb draws relatively little power, which is consistent with its use in a secondary or inner tail light role.
The outer tail light on the 2004-2008 TSX uses the 7443 bulb, a dual-filament T20 wedge type rated at 12V with a 21W/5W output. The two filaments serve separate functions, typically one for steady running light output and one for the higher-intensity brake or turn signal output.
The 7443 bulb continues in the outer tail light position through the 2009-2010 model years, maintaining the same dual-filament T20 specification.
The 168 and 7443 bulbs share a wedge-style base but are not interchangeable. The T10 and T20 designations refer to different physical sizes, and the wattage ratings differ substantially, making cross-substitution incompatible without modification.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances across manufacturers.
The dual-filament nature of the 7443 means the outer tail light position on the TSX handles more than one lighting function from a single socket, a design approach that reduces the number of required lamp housings.