Used for: Back Up Reverse Light Bulb
Used for: Parking Light Bulb(without LED parking Lights), Turn Signal Light Bulb Front
Used for: Turn Signal Light Bulb Rear
Used for: Dome Light Bulb
Used for: Interior Door Light Bulb, Map Light Bulb, Trunk or Cargo Area Light
Used for: Interior Door Light Bulb, Map Light Bulb, Trunk or Cargo Area Light
Used for: Vanity Mirror Light Bulb
Used for: Vanity Mirror Light Bulb
This page covers the bulb sizes for the 2018 Toyota Prius and is organized by lighting position so you can quickly confirm the correct replacement before you buy. Whether you are changing an exterior lamp or an interior bulb, the goal is to help you match the right bulb to the right socket without guessing.
The 2018 Toyota Prius uses a mix of LED and halogen-style bulb types depending on the lamp location and equipment level. That means the same model year can have different fitments for headlights, parking lights, turn signals, and interior lights, so checking by position is the safest way to identify the correct bulb.
Fitment can vary by trim, market, and lighting package, so always compare the bulb listed on this page with the bulb already installed in your Prius before ordering. Some versions use LED assemblies for certain exterior lights, while other positions may still use replaceable bulbs such as 921, 168/917, 194/7441, 7444NA, 7440A, or DE3175. If you are considering an aftermarket LED conversion, make sure the bulb base, polarity, and physical clearance are compatible, since brighter LEDs can sometimes create fitment or beam pattern issues. For the most reliable result, remove the old bulb first and verify the markings on the base before purchase.
The low beam headlight is listed as LED on this page. In some Prius configurations, the headlight system is an LED assembly rather than a replaceable halogen bulb.
The high beam headlight is also listed as LED. Because the lighting package can vary, it is best to confirm the exact headlamp setup on the vehicle before ordering parts.
The back up reverse light bulb is listed as 921.
The license plate light bulb is listed as LED, so the lamp may use an integrated LED setup instead of a standard replaceable bulb.
The brake light bulb is listed as LED. On many Prius versions, this means the brake light is part of an LED lamp assembly.
The front turn signal light bulb is listed as 7444NA.
The rear turn signal light bulb is listed as 7440A.
For versions without LED parking lights, the parking light bulb is listed as 7444NA.
For versions with LED parking lights, the parking light is listed as LED.
The dome light bulb is listed as DE3175, and it is noted as optional depending on the vehicle configuration.
Both the map light bulb and the trunk or cargo area light are listed as 168, 917.
The vanity mirror light bulb is listed as 194, 7441.
Yes. Trim and lighting package can change the bulb type, especially for LED-equipped exterior lamps, so the exact fitment should be verified by position and by the installed bulb.
Not if the lamp is designed as an LED assembly. LED-equipped positions usually require the correct LED unit or compatible replacement, while halogen-style bulbs are only appropriate where a replaceable bulb is specified.
Check the bulb already installed in your Prius, read the markings on the base, and compare them with the bulb position listed on this page before ordering.
