Nissan Frontier Brake Bulb Size

Additional Notes

• The 3157 bulb is the dominant brake bulb type across the Nissan Frontier, appearing in the brake light position for every model year from 1998 through 2019 with the exception of 2023. It follows the ANSI standard used in the US and Canada, operates at 12V, and carries a dual-filament design rated at 27W for the high-intensity stop function and 7W for the lower-intensity running light function within the same T25 wedge housing.
• The 2023 Nissan Frontier brake light position departs from the long-standing 3157 fitment, instead using the PY21W bulb. Unlike the 3157, the PY21W is a single-filament amber bulb governed by the ECE standard used in Europe and worldwide markets. It uses a BAU15s bayonet base and is rated at 12V, 21W. The BAU15s base is offset, meaning it is not interchangeable with the more common BA15s base found on other single-filament bulbs.
• The center high mount stop light (CHMSL) on the Frontier has used four distinct bulb types across its production span, reflecting changes in housing design across different generations. The 921 wedge bulb covers the widest range, fitting the 2005-2019 model years. It is an ANSI-standard T15 wedge bulb rated at 12V and 16W.
• The 2023 Frontier CHMSL uses the 912 bulb, which shares the same T15 wedge form factor as the 921 but is rated at a lower 12W rather than 16W. While the two bulbs are physically similar, the wattage difference means they are not direct substitutes without confirming housing and circuit compatibility.
• The 2003-2004 Frontier CHMSL uses the DE3175, a festoon-style bulb with a 31mm length and end-cap contacts. Festoon bulbs seat into spring-clip holders rather than twist-lock or push-in sockets, making them physically incompatible with the wedge-style sockets used in later model years.
• The 1998-2002 Frontier CHMSL uses the 2723, a miniature T5 wedge bulb rated at just 1.4W. This output is substantially lower than the 16W of the 921 used in later years, reflecting a different housing and circuit design in that generation of the vehicle.
• The 3157 dual-filament bulb serves both the stop and tail functions from a single housing by switching between its two filaments. This design is common in combined stop/tail lamp assemblies and is distinct from single-filament bulbs, which can only serve one function per socket.
• Across the CHMSL position, three different base types appear in the specifications: the T15 wedge base (912 and 921), the festoon end-cap (DE3175), and the T5 wedge base (2723). None of these base types are interchangeable with one another, and substituting across generations requires a compatible socket and housing, not only a matching voltage rating.