For the 2003 Kia Optima, the supplied fitment data lists a 9011 bulb for the high-beam headlight. No low-beam bulb is provided in this fitment data, so confirm the original low-beam bulb before ordering; the available information does not establish a low-beam size or a projector/non-projector variation.
Other useful lighting details include:
- Front turn signal and parking lights use 2357 bulbs.
- Rear turn signals use 1156A bulbs.
- Brake and tail lights use 2357R bulbs.
- Reverse lights and the center stop light use 921 bulbs.
- Front and rear side markers use 168NA bulbs.
- License plate and interior lighting may use either 168 or 917 bulbs, so compare the existing bulb and socket.
- The map light has two listed possibilities: 64111 or 64113. Compare the original bulb before replacement.
- The dome light uses 6461, while the trunk light uses 6418.