The Freightliner Sprinter front turn signal requires a 3457NA bulb size, while rear turn signal applications utilize PY21W or P21W bulb sizes. The replacement chart contains vehicle production years and bulb size specifications spanning 2002 to 2021.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 3457NA is an ANSI-standard dual-filament bulb rated at 12V with a 27W main filament and a 7W secondary filament. It uses a T25 wedge base and features natural amber glass, which produces the required amber signal color without relying on a colored lens.
The Freightliner Sprinter uses the 3457NA for the front turn signal across all listed model years from 2002-2021, making it the most consistently specified bulb in these fitment records.
For the 2019-2021 model years, the 3457NA front turn signal fitment carries a conditional note specifying it applies to vehicles equipped with halogen capsule headlamps, indicating that headlamp type is a relevant variable for correct front turn signal bulb selection in those years.
The PY21W is an ECE-standard single-filament bulb rated at 12V, 21W. It uses a BAU15s bayonet base, which has offset pins to prevent incorrect installation in sockets designed for other bayonet-type bulbs.
The P21W shares the same 12V, 21W single-filament rating as the PY21W but uses a BA15s bayonet base with symmetrically placed pins. The two bulbs are not interchangeable despite their identical wattage, as their base configurations differ.
The rear turn signal on the Sprinter transitioned from the P21W to the PY21W between the 2006 and 2007 model years. The P21W produces white light and depends on an amber lens for signal color, while the PY21W produces amber light directly from its bulb construction.
The 3457NA follows ANSI standards used in North America, while both the PY21W and P21W follow ECE standards common in European and international markets, reflecting the Sprinter's origins as a vehicle developed under European regulatory frameworks.
The base incompatibility between the BAU15s (PY21W) and BA15s (P21W) bayonet fittings means the rear turn signal bulbs from the pre-2007 and post-2006 model years cannot be substituted for one another without a corresponding socket change.