The INFINITI G20 front and rear turn signal bulbs utilize 7440 and 1156NA or 1156 bulb sizes depending on location and model variant. The replacement chart covers 1991 through 2002 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 INFINITI G20 front and rear turn signals use two distinct bulb families across its production span: the 1156/1156NA series for the 1991-1996 model years and the 7440 for the 1999-2002 model years.
The 7440 is a T20 wedge-base, single-filament bulb rated at 12V and 21W, conforming to ANSI standards applicable in the US and Canada.
The 1156 is a single-filament bulb with a BA15s bayonet base, also rated at 12V and 21W under the same ANSI standard.
The 1156NA shares the same BA15s bayonet base, voltage, and wattage as the 1156 but features natural amber glass, which produces an amber output without relying on a colored lens.
On the INFINITI G20, the 1156NA is specified exclusively for the front turn signal on 1991-1996 models, while the standard 1156 is specified for the rear turn signal on those same years.
The front and rear positions on 1999-2002 models both use the 7440, meaning the same bulb type serves both locations in that generation.
The T20 wedge base of the 7440 and the BA15s bayonet base of the 1156 series are physically incompatible socket types, so bulbs from one generation cannot be installed in sockets designed for the other.
Although the 1156 and 1156NA share the same base type and electrical ratings, substituting a clear 1156 for an 1156NA in the front position would alter the color output if the housing lens is clear rather than amber-tinted.