The Mazda B2300 front turn signal requires a 3157NA or 3157 bulb size, while the rear turn signal uses a 2356, 2456, or 3156 bulb size. The replacement chart covers 1994 through 2009 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mazda B2300 front turn signal position uses the 3157NA bulb for model years 2001-2009 and the 3157 bulb for model years 1994-1997.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V with a 27W/7W power split, distinguished from the standard 3157 by its natural amber glass envelope, which produces an amber output without relying on a colored lens.
The standard 3157 shares the same T25 wedge base, dual-filament design, and 12V/27W/7W electrical ratings as the 3157NA, differing only in the absence of the amber glass coating.
Both the 3157 and 3157NA conform to ANSI standards applicable in the United States and Canada, meaning their physical and electrical specifications are governed by a common standardization framework.
The dual-filament design of the 3157 and 3157NA allows a single bulb to serve two functions, typically running light duty on the lower 7W filament and turn signal duty on the higher 27W filament.
The rear turn signal position of the Mazda B2300 does not use a single consistent bulb type across its production run, with the 2356, 2456, and 3156 each appearing in multiple model years.
The 2356 is a dual-filament bulb with a BAY15d bayonet base rated at 12V, a base type that uses two offset pins to ensure correct orientation during installation, making it non-interchangeable with wedge-base bulbs.
The 3156 is a single-filament T25 wedge bulb rated at 12V and 27W, sharing the same physical base style as the 3157 and 3157NA but lacking a second filament, which means it is not a drop-in substitute for dual-filament applications.
The 2456 is classified as a festoon bulb intended for specialty applications, operating at 12V, and its cylindrical contact-end design is physically distinct from both wedge and bayonet base types.
Because the rear turn signal specifications vary by year across the B2300 production range, using a bulb from a different model year as a replacement carries a risk of fitment incompatibility.