Hyundai Sonata Side Marker Bulb Size

Additional Notes

• The 2357NA bulb, used in the front side marker of the Hyundai Sonata for model years 1995-1998 and 2002-2010, is a dual-filament type with a BAY15d bayonet base rated at 12V and 26.9W/8W. Its natural amber glass coating distinguishes it from the otherwise identical 2357, which produces white light from a clear envelope.
• The 168 bulb is a T10 miniature wedge type rated at 12V and 4.9W. It appears across both front and rear side marker positions on the Sonata across multiple generation spans, making it one of the most frequently recurring bulb sizes in these specifications.
• The 2357 bulb shares the same BAY15d bayonet base and 12V, 26.9W/8W dual-filament construction as the 2357NA but lacks the amber glass. On the Sonata, the 2357 is specified for the rear side marker on 2016-2018 models equipped with halogen capsule headlamps, indicating a trim-level or configuration dependency for that fitment.
• The 1157 bulb is also a dual-filament BAY15d type but is rated at a lower 21W/5W output compared to the 2357. Although both share the same base, the 2357 draws more power on its high-filament circuit, and the two are not considered interchangeable without accounting for that wattage difference.
• The 97 bulb is a single-filament BA15s bayonet type rated at 12V and 13W. It is classified as a variant of the 1156 family and is specified for both front and rear side markers on the Sonata from 1989-1994. The BA15s base is not compatible with the BAY15d base used by the 2357, 2357NA, and 1157 bulbs.
• The 12961 is a Philips part number for a T10 wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. It is specified solely for the 2019 front side marker position. While its wattage and base type are close to the ANSI 168, the 12961 is a manufacturer-specific designation rather than an ANSI standard number.
• The front and rear side marker positions on the Sonata do not consistently use the same bulb size within the same model year. For example, the 2006-2010 model years use a 2357NA at the front and a 168 at the rear, confirming that front and rear positions require separate verification before substitution.
• The BAY15d base, shared by the 2357, 2357NA, and 1157 bulbs, features two offset pins that prevent incorrect insertion of a single-filament bulb into a dual-filament socket. Despite this physical compatibility among the three types, wattage and glass coating differences mean they serve distinct functions across the Sonata's side marker positions.