The Isuzu Rodeo Sport turn signal requires a 1156 bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 2001 to 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Isuzu Rodeo Sport uses two distinct bulb types across its front and rear turn signal positions for the 2001-2003 model years, with the 1156NA assigned to the front and the 1157NA assigned to the rear.
The 1156NA is a single-filament bulb, meaning it serves one electrical function, which in this application is the front turn signal.
The 1157NA is a dual-filament bulb rated at 21W and 5W, allowing it to operate at two different brightness levels within the same housing, which is typical for combined stop and turn signal functions at the rear.
Both the 1156NA and 1157NA carry the NA suffix, indicating natural amber glass rather than a clear envelope with a colored lens or coating, a distinction relevant to replacement compatibility.
The 1156NA uses a BA15s bayonet base, which is a single-contact design, while the 1157NA uses a BAY15d bayonet base, a dual-contact offset design. These two bases are not interchangeable despite their physical similarity.
Both bulbs operate on a 12V electrical system and conform to ANSI standards recognized in the United States and Canada.
The front position draws 21W through its single filament, and the rear position also draws 21W on its primary filament, making the turn signal output wattage consistent across both ends of the vehicle.
The NA glass construction on both bulbs produces amber light directly from the source, which differs functionally from clear bulbs that rely on an amber-tinted lens to produce the required signal color.