The Acura RSX uses 7440NA and 7440 bulb sizes for both front and rear turn signal applications. The replacement chart covers 2002 through 2006 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Acura RSX uses two distinct bulb types across its production run for both front and rear turn signals: the 7440 and the 7440NA, both of which conform to ANSI standards recognized in the United States and Canada.
Both the 7440 and 7440NA are single-filament wedge bulbs built to the T20 form factor, operating at 12 volts and rated at 21 watts.
The 7440NA carries a natural amber glass envelope, which filters the light output to produce an amber color directly from the bulb itself rather than relying on a colored lens.
The 7440, by contrast, uses clear glass, meaning the amber turn signal color on 2002-2004 RSX models is produced by the vehicle's lens housing rather than the bulb.
For the 2002-2004 Acura RSX, the specified bulb size for both front and rear turn signals is the 7440.
The 2005-2006 Acura RSX requires the 7440NA for both front and rear turn signals, indicating a shift to a natural amber bulb in the later model years.
The front and rear turn signal positions share the same bulb specification within each model year, meaning no positional distinction exists between the two locations on the RSX.
Although the 7440 and 7440NA share the same T20 wedge base, voltage, and wattage, substituting one for the other may affect the color output of the turn signal if the lens housing is not tinted amber.