Geo Metro front and rear side marker bulbs utilize 168 and 194 bulb sizes for optimal illumination. The replacement chart covers 1989 to 1997 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 Geo Metro uses two bulb sizes across its side marker positions: the 168 and the 194. Both are ANSI-standard miniature wedge bulbs of the T10 form factor, rated at 12 volts.
Although the 168 and 194 share the same T10 wedge form factor and 12-volt rating, they differ in wattage. The 168 draws 4.9W, while the 194 draws 3.78W, making them electrically distinct despite their physical similarity.
The shared T10 form factor between the 168 and 194 means either bulb may physically fit the same socket. However, substituting one for the other results in a different wattage output, which affects light intensity.
For the front side marker on the Geo Metro, the 168 bulb applies to the 1991 and 1993-1997 model years. The 194 bulb applies to the 1989, 1990, and 1992 model years.
For the rear side marker, the 168 bulb applies to the 1989-1992 model years, while the 194 bulb applies to the 1993-1997 model years.
The 1992 Geo Metro presents an inverted fitment relative to most other years in the range: it uses the 194 at the front side marker and the 168 at the rear, the opposite of the pattern seen in 1993-1997.
In the 1993-1997 model years, the front and rear side markers use different bulb sizes from each other. The front takes the 168 and the rear takes the 194, so the two positions are not interchangeable during those years.
In the 1989 and 1990 model years, the front side marker uses the 194 and the rear also uses the 168, meaning both positions require separate bulb sizes in those years as well.
The 1991 model year is the only one in which both the front and rear side markers use the same bulb size. Both positions take the 168 in that year.