The Pontiac Trans Sport front side marker bulb uses a 194 or 194NA size, while the rear side marker bulb requires a 194 size. The replacement chart covers vehicle production spanning 1990 to 1998 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 194 and 194NA bulb types are the only sizes specified for the Pontiac Trans Sport across all listed model years and both front and rear side marker positions.
Both the 194 and 194NA are ANSI-standard miniature wedge bulbs of the T10 form factor, rated at 12V and 3.78W.
The 194NA is a natural amber glass variant of the standard 194 bulb, sharing identical voltage, wattage, and physical form factor with its clear counterpart.
The front side marker on the Trans Sport uses the 194NA for model years 1990-1996, indicating that amber coloring on those vehicles is achieved through the glass of the bulb itself rather than a tinted lens.
For the 1997-1998 Trans Sport, the front side marker specification changes to the standard clear 194 bulb, suggesting the amber output for those years is provided by the lens housing rather than the bulb.
Substituting a clear 194 for a 194NA in a housing designed for a clear lens on a 1990-1996 front side marker position would affect the amber color output of that light, as the bulb is the sole source of the amber tint in that configuration.
The rear side marker uses the standard clear 194 bulb for all years listed, covering 1991 and 1995-1998.
The T10 wedge base is a tool-free, push-in fitting that does not use a separate metal base, which is a defining physical characteristic of both the 194 and 194NA in these specifications.