Honda HR-V Turn Signal Bulb Size

Additional Notes

• The Honda HR-V front turn signal uses three different bulb types across the 2016-2023 model years: the 2357NA, 3457NA, and 7443NA/7444NA, making the front position the most variable fitment point in the turn signal system.
• The 2357NA bulb, fitted to the 2021-2023 HR-V front turn signal, is a dual-filament type with a BAY15d bayonet base rated at 12V and 26.9W/8W. The bayonet base distinguishes it physically from the wedge-base bulbs used in other model years, meaning it is not interchangeable with them despite sharing a similar wattage range.
• The 3457NA, used in the 2019-2020 front turn signal position specifically on trims equipped with halogen capsule headlamps, is a dual-filament T25 wedge bulb rated at 12V and 27W/7W. Its fitment is conditional on headlamp type, indicating that other headlamp configurations on those model years may use a different bulb.
• The 7443NA and 7444NA are both dual-filament T20 wedge bulbs rated at 12V and 21W/5W, with the 7443NA fitted to the 2017-2018 front turn signal and the 7444NA to the 2016 position. Although their electrical ratings are identical, they carry different ANSI designations and should not be assumed to be fully interchangeable without confirming base and socket compatibility.
• The 7440NA is a single-filament T20 wedge bulb rated at 12V and 21W. Unlike the dual-filament T20 variants used at the front, it carries only one filament, which reflects its dedicated rear turn signal function where a combined stop/turn operation is not required.
• The rear turn signal position on the HR-V uses the 7440NA across all model years from 2016-2023, making it the only turn signal position with no variation across the entire production span covered by these specifications.
• All five bulb types listed carry the "NA" suffix, which denotes natural amber glass. This coloring is built into the glass envelope itself rather than applied through a lens or coating, satisfying amber turn signal requirements without relying on a colored housing.
• All bulbs in these specifications conform to ANSI standards applicable to the US and Canadian markets. The T20 and T25 designations refer to the wedge base body size, with T25 being physically larger than T20, which affects socket fitment and rules out substitution between those two families.