The 2021 Toyota Prius uses integrated LED low-beam and high-beam headlights. The supplied fitment data does not list a replaceable bulb size for either beam, so replacement is handled as an LED lamp or assembly rather than by selecting a conventional halogen code.
Other exterior lighting is also LED-equipped, including the fog lights, front turn signals, brake lights, center stop light, daytime running lights, license plate lights, and tail lights. The rear turn signal uses a 7440 bulb. Parking lights and both front and rear side-marker lights use 2825 bulbs.
For the interior, the dome light uses DE3175, while the map, trunk, vanity, and other interior lights use 168 bulbs. Reverse-light fitment is not listed in the supplied data, so no bulb recommendation is provided for that location.