Chevrolet Impala Limited front turn signal bulbs use 4157NA or 5702AK size, while rear turn signal bulbs require 3057 size. The replacement chart covers 2014 to 2016 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 4157NA is an ANSI-standardized dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high-filament and 7W low-filament draw. Its natural amber glass produces the required amber signal color without relying on a lens or coating.
The 5702AK is a Sylvania-specific part number for a coated variant of the ANSI 3157 bulb. It shares the same T25 form factor and 12V, 27W/7W electrical ratings as the 4157NA, but achieves its amber output through a surface coating rather than tinted glass.
The 3057 is an ANSI-standardized T25 dual-filament wedge bulb rated at 12V, 27W/7W. Unlike the 4157NA and 5702AK, it is a clear bulb and relies on an amber lens in the housing to produce the required signal color.
All three bulb types across these specifications share the T25 wedge form factor and identical 12V, 27W/7W electrical ratings, meaning the physical and electrical interface is consistent throughout the Chevrolet Impala Limited's turn signal positions.
The front turn signal of the Chevrolet Impala Limited does not use a consistent bulb type across all model years. The 2014 and 2016 model years specify the 4157NA, while the 2015 model year specifies the 5702AK instead.
Because the 4157NA and 5702AK are both T25 dual-filament wedge bulbs with matching voltage and wattage ratings, they are electrically and physically interchangeable. However, the amber output method differs between the two, which may affect color output if the housing lens is also tinted amber.
The rear turn signal position uses the 3057 bulb uniformly across the 2014-2016 model years, indicating no variation in that position throughout the production run covered by these specifications.
The dual-filament design of all three bulb types means each bulb serves two brightness levels within a single housing, a configuration commonly used when a turn signal position also functions as a parking or running light.