Subaru XT front and rear side marker bulbs use a 194 size bulb for this model. The replacement chart covers 1985 to 1991 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Subaru XT uses the 194 bulb for both front and rear side marker positions across the 1985-1991 model years.
The 194 is a miniature wedge-type bulb, classified under the T10 form factor, which refers to its tubular shape with a wedge base that requires no separate socket retainer.
This bulb operates at 12 volts with a power draw of 3.78 watts, placing it in the low-wattage range typical of side marker and courtesy lighting applications.
The 194 carries ANSI standardization recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical tolerances shared across compliant manufacturers.
Because the same 194 bulb size is specified for both the front and rear side marker positions on the Subaru XT, a single bulb type serves all four side marker sockets on the vehicle.
The T10 wedge base is a widely used form factor in automotive lighting, and the 194 is one of several bulb numbers that share this base type, though wattage and voltage ratings can differ between those variants.
When replacing the 194 in the Subaru XT, substituting a T10-based bulb with a different wattage rating would not conform to the original specification, as the 3.78W rating is part of the defined ANSI standard for the 194.