Subaru Legacy Dome Light Bulb Size

Additional Notes

• The Subaru Legacy dome light bulb specification is DE3175 across the 2008-2021 model years, with the same size also applying to 1992, 1994, 1995, 1997, 1998, and 1999.
• The DE3175 is a festoon-type bulb with a 31mm length and end-cap contacts, operating at 12 volts. Festoon bulbs seat by pressing lengthwise between two spring-clip contacts rather than inserting into a socket.
• The 1990, 1991, and 1993 Subaru Legacy models use the 158 bulb, a miniature wedge type rated at 12V and 3W.
• The 1996 Legacy uses the 168 bulb, also a miniature wedge type but rated at 4.9W, making it a higher-wattage variant within the same T10 wedge family as the 158.
• All three bulb sizes listed in these specifications conform to ANSI standards applicable in the United States and Canada.
• The 158 and 168 are both classified as T10 miniature wedge bulbs, meaning they share the same wedge-base form factor. However, their wattage ratings differ, and substituting one for the other may affect circuit load and light output.
• The DE3175 festoon type and the T10 wedge types are physically incompatible with each other, as they use entirely different mounting and contact systems.
• The 1996 model year stands as the only year in these specifications to use the 168 bulb, distinguishing it from all surrounding model years.