Kia Sportage Turn Signal Bulb Size

Additional Notes

• The 2357NA bulb is the most frequently specified type across the Kia Sportage turn signal positions. It is a dual-filament ANSI-standard bulb rated at 12V with a high/low wattage of 26.9W/8W, fitted with a BAY15d bayonet base, and distinguished by its natural amber glass coating rather than a clear envelope.
• The natural amber ("NA") designation on bulbs such as the 2357NA and 1156NA indicates that the amber color is produced by tinted glass rather than by an amber-painted or amber-plastic lens. This distinction matters when the housing uses a clear lens, as a non-NA bulb in that application would produce white rather than amber light.
• The 2357 and 2357NA share identical electrical ratings of 12V and 26.9W/8W on a BAY15d base, but the 2357NA carries the natural amber glass coating that the 2357 does not. The two types are not interchangeable in applications where the lens color alone is relied upon to produce the legally required amber signal output.
• The Kia Sportage (2008) front turn signal uses the 2357, while the 2009-2023 model years use the 2357NA. Because the 2357 lacks the amber glass of the 2357NA, substituting one for the other in a clear-lens housing would affect the output color.
• The 1156 and 1156NA are functionally equivalent in wattage and base type, both being single-filament BA15s bulbs rated at 12V and 21W. The 1156NA adds natural amber glass, making the two non-interchangeable in clear-lens rear turn signal housings where amber output depends on the bulb itself.
• The rear turn signal on the 2024 Kia Sportage uses the PY21W, an ECE-standard single-filament amber bulb with a BAU15s base. The BAU15s base is offset compared to the BA15s base used by the 1156 and 1156NA, which physically prevents incorrect installation of those ANSI-standard bulbs in a socket designed for the PY21W.
• The 2007 Kia Sportage front turn signal specifies the P21W, an ECE-standard single-filament bulb with a BA15s base rated at 12V and 21W. Although the BA15s base is physically shared with the ANSI 1156 and 1156NA, the P21W is a clear-glass bulb governed by ECE rather than ANSI standards, and the two families are not considered direct equivalents.
• The rear turn signal for the 2020 Kia Sportage specifies the 12496 only in the configuration with halogen capsule headlamps. The 12496 is a Philips/Osram part number designating a specialty halogen bulb rated at 12V, indicating a trim-level or package-dependent fitment for that model year.
• The 1157 was specified for the Kia Sportage front turn signal in the 1995-1997 model years. It is a dual-filament BAY15d bulb rated at 12V and 21W/5W, which gives it a lower high-filament wattage than the 2357 and 2357NA at 26.9W, despite sharing the same base type.
• The BAY15d base used by the 2357, 2357NA, and 1157 is a dual-contact bayonet fitting with offset pins that prevent single-filament BA15s bulbs from being seated in dual-filament sockets, providing a physical safeguard against cross-installation between single- and dual-filament types.