Toyota Sequoia Parking Light Bulb Size

Additional Notes

• The 4157NA is the most frequently specified parking light bulb across the Toyota Sequoia lineup, covering model years 2008-2018. It is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament, finished in natural amber glass to meet ANSI standards for the US and Canada.
• The 3157NA, used on the 2001-2004 Toyota Sequoia, shares the same dual-filament T25 wedge construction and 12V/27W/7W electrical ratings as the 4157NA. Despite these similarities, the two bulb types carry different ANSI designations and are not confirmed as interchangeable by the specifications.
• The 7440NA applies to the 2023-2024 model years. Unlike the dual-filament bulbs used in earlier years, it is a single-filament T20 wedge bulb rated at 12V and 21W, also finished in natural amber glass.
• The natural amber glass coating on the 7440NA, 4157NA, and 3157NA produces an amber light output directly from the bulb itself, without relying on a colored lens housing to achieve the required amber appearance.
• The 2005-2007 Sequoia uses the 168 bulb, a miniature T10 wedge type rated at 12V and 4.9W. Its wattage is substantially lower than all other bulb types listed across the Sequoia's parking light history.
• The 168 bulb carries no NA suffix, indicating it does not have a natural amber glass coating, which distinguishes it from the other bulb types specified for the Sequoia's parking lights.
• All four bulb types across the full model range conform to ANSI standards applicable in the US and Canada, and all operate on a 12V electrical system consistent with standard automotive architecture.
• The wedge base design shared by the T10, T20, and T25 bulb families means physical socket size differs across these groups, making cross-substitution between the 168, 7440NA, 4157NA, and 3157NA types incompatible without modification.