Hyundai Tucson Turn Signal Bulb Size

Additional Notes

• The 2357NA is the most frequently specified front turn signal bulb across the Hyundai Tucson range, covering model years 2010-2020 in that position, with the NA suffix denoting a natural amber glass envelope rather than a clear bulb with a coated or painted lens doing the color filtering work.
• The PY21W bulb, fitted to the 2021-2022 Tucson front turn signal, follows ECE regulatory standards used in Europe and worldwide markets, whereas all other bulbs in these specifications follow ANSI standards common to the US and Canada. The BAU15s bayonet base of the PY21W is offset and is not interchangeable with the BA15s or BAY15d bases found on the ANSI bulbs listed elsewhere in these specifications.
• The 2357NA and 2357 bulbs share a dual-filament design with a BAY15d bayonet base and identical 26.9W/8W ratings, with the only distinction being that the 2357NA carries a natural amber glass envelope. The 2357 without the NA suffix appears in the rear turn signal position for 2019-2020 model years.
• The 1156 and 1156NA share the same BA15s bayonet base and 12V, 21W single-filament construction, differing only in that the 1156NA has a natural amber glass envelope. Both types appear across multiple rear turn signal years, and the base compatibility means the physical fitment is the same between them, though the amber filtering method differs.
• The 921 is a wedge-base T15 bulb rated at 12V and 16W, which is a lower wattage than the 1156-type bulbs used in adjacent model years for the rear turn signal. The wedge base design is mechanically distinct from the bayonet bases used by all other bulbs in these specifications, making it non-interchangeable with them.
• For the 2019-2020 Hyundai Tucson, the front turn signal specification of 2357NA is noted specifically as applying to vehicles with halogen capsule headlamps, indicating that a trim or configuration variable affects the correct front turn signal bulb for those years.
• The rear turn signal position on the Tucson has used four distinct bulb types across the years covered in these specifications: 1156NA, 1156, 2357, and 921, reflecting that rear turn signal fitment is not consistent across the model's history and direct substitution between years is not always possible.
• The dual-filament 2357 and 2357NA bulbs, when used in a single-filament turn signal circuit, typically operate on only one of the two filaments, but their BAY15d base with two offset pins is physically distinct from the single-filament BA15s base, preventing accidental installation of a single-filament 1156-type bulb in a socket designed for the dual-filament type.