Honda Odyssey Turn Signal Bulb Size

Additional Notes

• The 7440NA single-filament T20 wedge bulb is the most consistently used rear turn signal bulb across the Honda Odyssey lineup, appearing in that position from 1995 through 2024. The standard 7440 variant, which lacks the natural amber glass coating, was used in the rear position for model years 1995-2004 and again in 2018-2020.
• The "NA" suffix present on many bulb designations in these specifications denotes natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an amber-tinted lens in the housing. This distinction is relevant when the vehicle's turn signal lens is clear rather than colored.
• The front turn signal position on the Honda Odyssey has used a notably wider variety of bulb types than the rear, with at least six distinct part numbers specified across the 1995-2024 model range.
• The 2357NA dual-filament BAY15d bulb is specified for the front turn signal on the 2021-2024 Odyssey. At 26.9W/5W, its dual-filament design allows a single bulb to serve both a running light and a turn signal function within the same housing.
• The 3457NA and 3357NA designations both reference T25 wedge-base bulbs, but they differ in filament count. The 3457NA is dual-filament at 27W/7W, while the 3357NA is single-filament at 27W. The Odyssey front turn signal used the 3457NA in 2011-2016 and 2018, and the 3357NA in 2014 and 2017, meaning the two types were not interchangeable in those positions despite sharing the same base format.
• The 7444NA is a dual-filament T20 wedge bulb rated at 21W/5W and was specified for the front turn signal in the 2019-2020 Odyssey. It shares the T20 wedge base with the 7440NA but carries a second filament, making it a different type despite the similar designation.
• The 1034NA is described as a variant of the 1157 and shares the BAY15d bayonet base and dual-filament configuration. It was specified for the front turn signal on the 1999 and 2002-2004 Odyssey. The 1157NA, also a dual-filament BAY15d bulb, was used in the same position for 2000-2001.
• The 2057 bulb, used in the front turn signal position on the 1995-1998 Odyssey, is described as a brighter variant of the 1157. Both share the BAY15d bayonet base and dual-filament design, but the 2057 is rated at 26.9W/8W compared to the 1157NA's 21W/5W, indicating a higher output on both filaments.
• BAY15d bayonet-base bulbs and T20 or T25 wedge-base bulbs are physically incompatible with one another. Several front turn signal positions on the Odyssey transitioned between these base types across model years, which means a bulb from one generation is not a direct physical fit for another without a socket adapter.
• The 7440 and 7440NA share the same T20 wedge base and single-filament 21W rating, with the only difference being the amber glass coating on the NA variant. In positions where the housing uses an amber lens, either type may produce a functionally similar visible output, though the specifications list them as distinct part numbers for their respective model years.