The Mazda Millenia front turn signal requires a 1156NA or 3497 bulb size, while the rear turn signal uses a 7440NA, 1156NA, or 1156 bulb size. The replacement chart covers 1995 to 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 1156NA is the most widely used bulb type across the Mazda Millenia turn signal specifications, appearing in both front and rear positions across multiple model years. It is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base and natural amber glass.
The natural amber glass of the 1156NA produces an amber-colored output without relying on an amber-tinted lens, which is the functional distinction between it and the clear-glass 1156.
The 3497 is specified for the front turn signal on the Mazda Millenia for model years 1995-1998. It shares the same BA15s bayonet base, 12V rating, and 21W output as the 1156 family and is classified as a variant of that type.
The 7440NA is a T20 wedge-base bulb, which uses a different mounting system than the BA15s bayonet base found on the 1156NA, 3497, and 1156. It is rated at 12V and 21W and features natural amber glass.
The rear turn signal on the Mazda Millenia transitions from the 1156 (clear glass) for 1995-1998 to the 1156NA (natural amber glass) for 1999-2000, and then to the 7440NA for 2001-2002. These are not interchangeable due to differences in base type and glass tint.
The 1156 and 1156NA share the same BA15s bayonet base and electrical ratings, but the amber glass coating on the 1156NA makes them functionally distinct in applications where the lens itself is clear rather than amber-tinted.
The 7440NA specified for the 2001-2002 rear turn signal uses a wedge base, meaning it is physically incompatible with the BA15s bayonet sockets used in earlier Millenia model years.
All four bulb types across the Millenia turn signal specifications operate at 12V and 21W, placing them within the same electrical load category despite their differences in base type and glass treatment.
The front turn signal on the Mazda Millenia uses the BA15s bayonet base throughout all listed model years, with the 3497 covering 1995-1998 and the 1156NA covering 1999-2002.
All bulb types listed in these specifications conform to ANSI standards applicable to the United States and Canada, indicating standardized sizing and electrical performance within those markets.