For the 2018 Toyota Prius, both the low-beam and high-beam headlights use LED lighting. The supplied fitment data does not list a replaceable bulb number for either headlight function, so verify the original lamp assembly before ordering replacement parts.
Front turn signals use 7444NA bulbs, while rear turn signals use 7440A. Reverse lights use 921 bulbs. The brake lights, center stop light, daytime running lights, front and rear side markers, tail lights, and license plate lights are listed as LED.
Parking-light fitment depends on the vehicle configuration: models with LED parking lights use LED units, while models without LED parking lights use 7444NA bulbs. No fog-light fitment is listed. For the interior, the dome light uses DE3175. Map, trunk, and other interior locations may use either 168 or 917 bulbs, while vanity lights may use 194 or 7441 bulbs. Check the existing bulb and socket when a location has multiple listed options.