Honda Passport Turn Signal Bulb Size

Additional Notes

• The front turn signal positions across the Honda Passport model years covered in these specifications use dual-filament bulbs exclusively, while the rear turn signal positions use single-filament bulbs throughout all listed years. This reflects a common automotive design pattern where front turn signals share a filament with parking or daytime running functions, whereas rear turn signals operate independently.
• The 7440NA is the rear turn signal bulb for the 2019-2024 Honda Passport. It is a single-filament T20 wedge bulb rated at 12V and 21W with natural amber glass. The T20 wedge base is not interchangeable with the BAY15d or BA15s bayonet bases used in earlier model years, making cross-year substitution incompatible without a socket adapter.
• The 1156 bulb serves as the rear turn signal across all listed model years from 1994-2002. It uses a BA15s single-contact bayonet base and is rated at 12V and 21W. The BA15s base differs from the BAY15d base used in front turn signal bulbs of the same era; the two bases are not interchangeable despite their similar appearance, as the BAY15d has offset pins to prevent incorrect installation of dual-filament bulbs in single-filament sockets.
• The 1034 and 1034NA bulbs appear as front turn signal fitments for the 1994-2001 Honda Passport. Both are described as variants of the 1157 and share the same BAY15d bayonet base and 12V, 21W/5W dual-filament rating. The distinction between the two is the natural amber glass coating present on the 1034NA, which produces an amber signal output without relying on an amber lens.
• The 1157NA replaces the 1034NA as the front turn signal fitment for the 2000 and 2002 Honda Passport. Like the 1034NA, it uses a BAY15d base and natural amber glass, but its wattage differs at 21W/5W versus the 1034NA's identical rating, and it carries the 1157 designation rather than the 1034 variant classification. The 1034NA and 1157NA are not confirmed as direct substitutes despite their shared base type and similar ratings.
• The "NA" suffix present on several bulb designations, including the 2357NA, 7444NA, 1157NA, 1034NA, and 7440NA, denotes natural amber glass. This coating filters the light output to amber at the source, which is a method used to meet turn signal color requirements without depending solely on a colored lens housing.
• The 2357NA and 7444NA serve as front turn signal bulbs for different model years of the second-generation Passport. The 2357NA, used in 2021 and 2024, has a BAY15d bayonet base and is rated at 26.9W/8W, while the 7444NA, used in 2023, is a T20 wedge bulb rated at 21W/5W. These two bulbs use different base types and are not interchangeable with each other.
• The 3457 bulb is the front turn signal fitment for the 2019-2020 Honda Passport. It is a dual-filament T25 wedge bulb rated at 12V, 27W/7W. The T25 wedge base is physically larger than the T20 wedge base used by the 7444NA and 7440NA, and the two wedge sizes are not interchangeable.