Hyundai Elantra Tail Light Bulb Size

Additional Notes

• The 2357 bulb is the most frequently specified size across the Hyundai Elantra tail light data, appearing in both inner and outer tail light positions across multiple model years. It is a dual-filament bulb with a BAY15d bayonet base rated at 12V and 26.9W on its high filament and 8W on its low filament, making it a higher-output variant of the 1157.
• The 1157 shares the same BAY15d bayonet base as the 2357 and is physically interchangeable in terms of socket fitment, but its filaments draw less power at 21W and 5W respectively. Both bulbs serve dual functions, typically combining stop and tail light duties within a single unit.
• The 12961 is a Philips part number rather than an ANSI standard designation. It is a T10 miniature wedge bulb with a W2.1x9.5d base rated at 12V and 5W, and it appears in the inner tail light position for the 2019 Elantra as well as the 2022-2024 outer tail light position.
• The 921 is a T15 wedge bulb rated at 12V and 16W, placing its output between the low-power T10 types and the dual-filament bayonet types. It is specified for the 2022 outer tail light and for the 2019 inner tail light on units produced from March 21, 2017 onward.
• The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W, specified exclusively for the inner tail light on 2013-2016 Elantra models. For 2014-2016, its fitment is conditioned on the absence of projector-type headlamps, indicating that headlamp configuration influenced the tail light assembly used.
• The 2019 Hyundai Elantra inner tail light position lists two different bulb sizes, 12961 and 921, where the 921 applies specifically to vehicles produced from March 21, 2017 onward. This production date cutoff reflects a mid-cycle assembly change rather than a model year boundary.
• The 2016 outer tail light position also carries a production date split, with the 2357 applying to vehicles built through December 22, 2015, and the 1157 applying from December 15, 2015 onward. The overlapping date range between these two cutoffs indicates a transition window during which either bulb may have been installed at the factory.
• The T10 wedge base format is shared by both the 168 and the 12961, though the two bulbs differ in their wattage ratings and designation systems. The 168 follows the ANSI standard used in North America, while the 12961 is identified by a Philips-specific part number referencing the same physical base type.