Mercedes-Benz E400 Turn Signal Bulb Size

Additional Notes

• The 3457NA bulb follows the ANSI standard used in the US and Canada. It is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament, and features natural amber glass that produces a yellow-orange light without the need for a colored lens or housing.
• The 3357NA bulb also conforms to the ANSI standard and shares the same T25 wedge form factor and natural amber glass as the 3457NA. However, it carries only a single filament rated at 27W, meaning it operates at one fixed output level rather than two.
• The 3457NA is the front turn signal bulb size for the Mercedes-Benz E400 for the 2014-2015 model years.
• For the 2013 model year, the correct front turn signal bulb size depends on the headlamp configuration of the specific vehicle. Two distinct fitments exist for that year.
• A 2013 E400 equipped with a Traffic Static LED headlamp takes the 3457NA dual-filament bulb for the front turn signal.
• A 2013 E400 without the Intelligent Light System (ILS) takes the 3357NA single-filament bulb for the front turn signal instead.
• Although the 3457NA and 3357NA share the same T25 wedge base and physical form factor, they are not interchangeable. Substituting one for the other in a mismatched application would result in incorrect filament behavior for that vehicle's circuit design.
• The natural amber glass on both bulb types is integral to their designation. The "NA" suffix in both part numbers specifically denotes this natural amber coloring, which is distinct from clear-glass variants of otherwise similar bulbs.