Nissan Frontier Turn Signal Bulb Size

Additional Notes

• The front turn signal on the Nissan Frontier uses three distinct bulb types across its model history: the 1156NA (1998-2000), the 3456 and 3457 family (2001-2008), and the 7443NA or 7444NA (2009-2024). The rear turn signal follows a separate progression, moving from the 3157 and 3157NA to the 3156NA and, in 2023, the 7440.
• The 7444NA and 7443NA are both T20 dual-filament wedge bulbs rated at 12V with a 21W high-filament and 5W low-filament output. Both carry natural amber glass, which produces the amber signal color without relying on a colored lens. The 7444NA is the front turn signal bulb for the 2017-2024 Frontier (excluding 2020-2022), while the 7443NA serves the same position for 2012-2016 and 2010.
• The 3456 and 3457 are both T25 wedge bulbs rated at 12V and 27W on their primary filament, but they differ in filament count. The 3456 is a single-filament bulb, while the 3457 carries a dual filament with a secondary 7W output. The Frontier front turn signal used the 3456 from 2001-2004 and switched to the 3457 for 2005-2008, making these two bulbs non-interchangeable despite their physical similarity.
• The 1156NA, used in the front turn signal position on the 1998-2000 Frontier, differs from all other bulbs in these specifications by using a BA15s bayonet base rather than a wedge base. This base type is mechanically incompatible with wedge-style sockets, so it cannot be substituted with any of the T20 or T25 wedge bulbs listed for later model years.
• The 3156NA, which serves as the rear turn signal bulb for the 2005-2019 Frontier, is a single-filament T25 wedge bulb with natural amber glass rated at 12V and 27W. It replaced the dual-filament 3157NA used from 2001-2004, meaning the rear socket transitioned from a two-filament to a one-filament configuration at that point. These two bulbs share the same T25 wedge housing but are wired differently and are not interchangeable.
• The 3157 and 3157NA are both dual-filament T25 wedge bulbs rated at 12V, 27W/7W, and they share identical electrical characteristics. The only distinction is that the 3157NA incorporates natural amber glass while the 3157 uses clear glass. The rear turn signal on the 1998-2000 Frontier used the clear 3157, while the 2001-2004 Frontier used the amber 3157NA in the same position.
• The 7440, used in the rear turn signal position on the 2023 Frontier, is a single-filament T20 wedge bulb rated at 12V and 21W. It shares the same wedge base family as the 7443NA and 7444NA but lacks the secondary filament and natural amber glass found on those front-position bulbs. The 7440 is not a drop-in substitute for the 7443NA or 7444NA in applications that require dual-filament operation.
• Several bulbs across these specifications carry the "NA" suffix, which denotes natural amber glass construction. This coating shifts the emitted light to an amber hue at the source rather than relying on an amber-tinted outer lens. Bulbs without the NA suffix, such as the 3457, 3157, and 7440, emit white or clear light and depend on the vehicle's lens to produce the required amber signal color.