The Acura TSX side marker utilizes a 168 bulb size for illumination purposes within the lighting assembly. Data for the specific component covers the range from 2004 through 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura TSX uses the 168 bulb for both front and rear side marker positions across the 2004-2010 model years.
The 168 is classified as a miniature wedge bulb under the T10 form factor, which refers to a tubular glass envelope roughly 10mm wide with a wedge-style base that requires no socket pins.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of side marker applications where continuous illumination is expected without significant heat output.
The 168 carries ANSI standardization recognized in both the United States and Canada, meaning the specification reflects a regulated performance and dimensional standard rather than a proprietary part number.
Because the same bulb size applies to all seven model years across both the front and rear side marker positions on the Acura TSX, a single 168 bulb serves all four side marker sockets on any TSX from this generation.
The T10 wedge base format is shared by several bulb designations beyond the 168, including the 194 and 2825. These alternatives carry different wattage ratings and are not direct equivalents, so substitution would affect electrical load and potentially luminous output.
At 4.9 watts, the 168 draws slightly less power than the 194, which is rated at 5 watts. While the physical base is compatible between these types, the 168 and 194 are distinct ANSI designations and are not interchangeable without accounting for the wattage difference.