The Mitsubishi Endeavor front side marker requires 1157NA or 1034NA bulb sizes, while the rear side marker uses 1157 bulb size. The replacement chart covers 2004 through 2011 model 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 Endeavor uses the 1157NA bulb for the front side marker across the 2005-2011 model years, with the exception of 2004, which uses the 1034NA instead.
The 1157NA is a dual-filament bulb rated at 12V with a 21W/5W power draw, fitted with a BAY15d bayonet base and natural amber glass.
The BAY15d bayonet base features two offset pins that lock the bulb into position, a design that also prevents incorrect insertion orientation.
The natural amber glass of the 1157NA produces an amber light output directly from the bulb itself, without relying on a colored lens housing to achieve the amber appearance.
The 1034NA used in the 2004 Mitsubishi Endeavor front side marker shares the same BAY15d bayonet base, dual-filament design, 12V rating, and 21W/5W power draw as the 1157NA, and is classified as a variant of it.
Despite the close relationship between the 1034NA and 1157NA, they are listed as distinct part numbers and are specified for different model years in the front side marker position.
The rear side marker position uses the 1157 across all listed model years, from 2004 through 2011, including the 2004 model year that differs in its front side marker specification.
The 1157 shares the same BAY15d base, dual-filament construction, 12V voltage, and 21W/5W wattage as the 1157NA, but does not carry natural amber glass.
The dual-filament configuration of all three bulb types supports two separate brightness levels, typically serving both a running light function and a brighter signaling function within a single housing.
The front and rear side marker positions on the Endeavor do not share the same bulb type, as the front positions specify amber-glass variants while the rear position specifies the clear-glass 1157.