Honda CIVIC SEDAN 2018 Owner's Manual page 544

uuReplacing Light BulbsuFront Turn Signal Light Bulbs
Models with halogen headlights
Front Turn Signal Light Bulbs
When replacing, use the following bulbs.
Front Turn Signal Light: 21 W (Amber)
Socket Bulb
Models with LED headlights
Front Turn Signal Lights
Front turn signal lights are LED type. Have an authorized Honda dealer inspect and
replace the light assembly.
542
1. Turn the socket counter-clockwise and
remove it.
2. Remove the old bulb and insert a new bulb.