Acura ILX front and rear turn signal bulbs use 7440 and 7440NA sizes for replacement. The chart covers 2013 through 2022 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 7440 and 7440NA are the two bulb types specified for the Acura ILX across all listed model years. Both share the same T20 wedge base, single-filament design, 12-volt rating, and 21-watt output, making them electrically identical.
The sole distinction between the 7440 and 7440NA is the glass envelope. The 7440NA uses natural amber-tinted glass to produce an amber signal output, while the 7440 relies on a clear envelope, with any amber color coming from the lens housing itself.
The Acura ILX front turn signal uses the 7440 for the 2013-2015 model years. No 7440NA variant is specified for the front position.
The rear turn signal on the 2013-2015 ILX also uses the standard 7440, while the 2016-2022 rear position transitions to the 7440NA. These two bulbs are not interchangeable without affecting the amber output characteristics of the signal light.
Substituting a clear 7440 in place of a 7440NA in the 2016-2022 rear position would only produce amber output if the tail lamp housing contains an amber lens. Installing the wrong variant in a clear-lens housing would result in a white or non-compliant signal color.
Both the 7440 and 7440NA are defined under ANSI standards applicable in the United States and Canada, confirming their fitment within North American market vehicles.
The T20 wedge base format means neither bulb uses a bayonet or pin-style socket. The wedge design seats by friction, and both the 7440 and 7440NA share this same socket type, which is why the two are physically interchangeable at the socket level despite their optical differences.
At 21 watts, the 7440 and 7440NA draw a relatively high current for a signal bulb, which is relevant when considering LED replacements, as the lower wattage of LED alternatives can trigger hyperflash in vehicles with load-sensitive flasher relays.