Subaru WRX high beam headlight bulbs use 9005 size while low beam headlight bulbs use H11 size. The chart covers replacement bulb specifications from 2018 to 2021.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9005 bulb is a single-filament halogen type operating at 12V and 65W, built to the ANSI standard used in the United States and Canada. It uses a P20d base and serves as the high beam bulb across all listed Subaru WRX model years.
The H11 bulb is a single-filament halogen type operating at 12V and 55W, built to the ECE standard used in Europe and worldwide, though it also carries approval for use in the United States. It uses a PGJ19-2 base and serves as the low beam bulb across all listed model years.
The 9005 and H11 bulbs draw different wattages, 65W and 55W respectively, which reflects their distinct roles. High beam applications typically require higher output, consistent with the 9005 rating.
The 9005 and H11 use physically different bases, P20d and PGJ19-2 respectively, meaning the two bulb types are not interchangeable with each other despite both being single-filament halogen designs.
For the Subaru WRX, the 2019-2020 model years carry a "With Halogen Capsule Headlamps" qualifier on both the high beam and low beam entries, indicating that the 9005 and H11 fitments apply specifically to vehicles equipped with that headlamp configuration rather than to all trim variants of those years.
The 2018 and 2021 model years list the 9005 and H11 bulbs without any trim or equipment qualifier, indicating those sizes apply without a conditional headlamp type restriction for those years.