Subaru Impreza Dome Light Bulb Size

The Subaru Impreza dome light requires bulb sizes DE3175 and 168 depending on the specific version of the vehicle. Available information covers the span from 1993 through 2024 for the listed components.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2024	DE3175
2015-2019	DE3175
2001	168
2000	DE3175
1994-1999	168
1993	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The DE3175 is a festoon-type bulb measuring 31mm in length with end-cap contacts, operating at 12 volts. Festoon bulbs make contact at both ends of the housing rather than through a base socket, which is a distinct fitment characteristic compared to wedge-style bulbs.
The 168 bulb is a miniature wedge type, classified under the T10 form factor, rated at 12 volts and 4.9 watts. Wedge bulbs use a pinched glass base that grips directly into the socket without a separate metal base.
Both the DE3175 and 168 are ANSI-standardized bulbs for the US and Canadian markets, meaning their physical and electrical specifications conform to a defined industry standard rather than being proprietary sizes.
The Subaru Impreza uses the DE3175 for its dome light across the 2015-2019 and 2024 model years, as well as in 1993 and 2000, making it the more frequently specified of the two bulb types across the listed range.
The 168 wedge bulb is specified for the Subaru Impreza dome light from 1994-1999 and again in 2001. Because the 168 and DE3175 are physically incompatible bulb types, one cannot be substituted for the other without a socket adapter or housing modification.
The year 2000 Subaru Impreza specifies the DE3175, while the immediately adjacent years 1999 and 2001 specify the 168 bulb. This means the socket type changed between certain model years, and fitment must be confirmed against the specific year rather than assumed from nearby years.