The Mitsubishi Expo front turn signal requires a 1156 bulb size, while rear turn signal applications use either 3497 or 1156 bulb sizes. The replacement chart covers 1992 through 1995 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 Mitsubishi Expo uses the 1156 bulb for the front turn signal across all model years covered, specifically 1992-1995.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
A BA15s bayonet base features a single contact pin, which mechanically distinguishes it from dual-pin bayonet variants and prevents cross-installation with incompatible bases.
The rear turn signal on the Expo used the 1156 bulb for 1992-1994 but shifted to the 3497 for the 1995 model year.
The 3497 is classified as a variant of the 1156, sharing the same BA15s bayonet base, 12V operating voltage, and 21W power rating.
Because the 3497 and 1156 share the same base type and electrical ratings, the physical and electrical specifications between the two are effectively identical under ANSI standards.
Both the 1156 and 3497 carry ANSI certification applicable to the US and Canadian markets, indicating conformance to standardized performance and dimensional criteria for those regions.
The rear turn signal position on the 1995 Expo is the only application in these specifications where the 3497 replaces the 1156, making it a position-specific fitment distinction rather than a vehicle-wide change.