The Acura RDX tail light utilizes a 168 bulb size for the rear lighting assembly. Provided information covers the span of time from 2007 through 2015 for the specified vehicle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura RDX tail light system across the 2007-2015 model years uses two distinct bulb types: the 168 and the 7443, each serving different positions within the tail light assembly.
The 168 bulb is an ANSI-standard miniature wedge type rated at 12V and 4.9W, conforming to the T10 wedge base format recognized in both the US and Canada.
The 7443 bulb is an ANSI-standard dual-filament wedge type rated at 12V with a 21W/5W output, conforming to the T20 wedge base format recognized in both the US and Canada. The dual-filament design allows a single bulb to serve two brightness levels, typically used for combined stop and tail light functions.
The inner tail light position on the Acura RDX uses the 168 bulb for all model years from 2007-2015.
The outer tail light position uses two bulb types simultaneously: the 7443 and the 168, both specified across all model years from 2007-2015.
The 168 and 7443 bulbs are not interchangeable with each other. They differ in base size, wattage, and filament configuration, with the T10 and T20 wedge bases being physically incompatible.
The 4.9W rating of the 168 bulb places it in the low-output category, consistent with indicator or supplemental lighting roles rather than primary stop or tail light functions.
The 21W filament of the 7443 corresponds to stop light output, while the 5W filament corresponds to running light output, both within a single T20 wedge housing.