Hyundai Kona Turn Signal Bulb Size

Additional Notes

• The 2357NA bulb follows the ANSI standard used in the United States and Canada. It is a dual-filament bulb rated at 12V with a high/low wattage split of 26.9W and 8W, and it uses a BAY15d bayonet base. The natural amber glass produces the required amber signal color without relying on a colored lens.
• The Hyundai Kona front turn signal uses the 2357NA across the 2019-2021 and 2023 model years, making it the most frequently specified bulb in these listings. Its dual-filament design means the two filaments serve separate functions, though only the turn signal circuit is relevant in this application.
• The PY21W follows the ECE standard used in Europe and worldwide markets. It is a single-filament bulb rated at 12V and 21W, and it uses a BAU15s bayonet base. The offset pin arrangement of the BAU15s base is physically distinct from other 15mm bayonet bases, preventing incorrect installation of non-amber bulbs in amber-designated sockets.
• The 2022 Hyundai Kona front turn signal specifies the PY21W rather than the 2357NA used in adjacent model years. Because the PY21W uses a BAU15s base and the 2357NA uses a BAY15d base, these two bulbs are not interchangeable despite sharing the same voltage and a similar wattage range.
• The P21W is an ECE-standard single-filament bulb rated at 12V and 21W, using a BA15s bayonet base. Unlike the PY21W, the P21W has a clear glass envelope and relies on a colored lens or housing to produce the required signal color. It serves as the rear turn signal bulb across the 2018-2022 model years.
• The 1156NA is an ANSI-standard single-filament bulb rated at 12V and 21W with a BA15s bayonet base and natural amber glass. It shares the same base type as the P21W, but the two standards are not directly interchangeable across all applications due to differing regulatory classifications and glass coloring.
• The rear turn signal specification shifts from P21W to PY21W for the 2023-2024 Hyundai Kona. Although both are single-filament 12V/21W bulbs, the P21W uses a BA15s base while the PY21W uses a BAU15s base, meaning the socket design differs between these model year groups.
• Across both front and rear positions, the Kona specifications draw from two distinct regulatory standards: ANSI (2357NA, 1156NA) and ECE (PY21W, P21W). Bulbs from one standard are not substitutes for those from the other, as base configurations and glass coloring differ in ways that affect both physical fitment and regulatory compliance.