For the 2003 Hyundai Sonata, the supplied fitment data lists an H1 bulb for the high beam. No low-beam bulb is specified in this data, so verify the low-beam bulb from the existing lamp or vehicle documentation before ordering. No fog-light fitment is listed either.
Other exterior lighting uses several common replacement bulbs. The front turn signal, parking light, and front side marker use 2357A. Rear lighting includes 1157R for the brake and tail lights, 1157A for the rear side marker, and 1156A for the rear turn signal. The reverse light uses 1156. The center stop light is listed as LED, rather than a replaceable bulb size.
- License plate and courtesy lighting may use either 168 or 917.
- Dome and map lights use 64111.
- The trunk light uses 6418.
Check the socket and lamp assembly before purchase, particularly where more than one bulb option is listed.