The Mercedes-Benz E500 front turn signal uses bulb sizes 2357NA, 1156NA, or P21/5W, while the rear turn signal requires P21W or PY21W bulb sizes. The replacement chart covers 1994 to 2006 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 Mercedes-Benz E500 front turn signal uses the 2357NA bulb for the 2004-2006 model years. This is a dual-filament, natural amber glass bulb rated at 12V with a wattage split of 26.9W and 8W across its two filaments.
The 2357NA follows the ANSI standard, which governs bulb specifications in the United States and Canada. It uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect installation by ensuring only one rotational orientation fits the socket.
The 2003 Mercedes-Benz E500 front turn signal uses the 1156NA bulb rather than the 2357NA. The 1156NA is a single-filament bulb rated at 12V and 21W, also carrying natural amber glass and ANSI certification.
The 1156NA uses a BA15s bayonet base, which is a single-pin design. This base is not interchangeable with the BAY15d base found on the 2357NA, meaning the 2003 front turn signal socket is physically incompatible with the bulb used in the 2004-2006 model years.
The 1994 E500 front turn signal uses the P21/5W, an ECE-standard dual-filament bulb rated at 12V with filaments at 21W and 5W. It shares the BAY15d bayonet base with the 2357NA, though the two standards differ in wattage output and certification region.
Despite sharing the same BAY15d base, the P21/5W and 2357NA are not confirmed interchangeable, as they originate from different regulatory standards and carry different wattage ratings across their filaments.
The 2003 E500 rear turn signal uses the P21W, an ECE-standard single-filament bulb rated at 12V and 21W with a BA15s bayonet base. The 1156NA used in the 2003 front position shares the same base type and wattage, though the two are governed by different standards.
The 1994 E500 rear turn signal uses the PY21W, which differs from all other bulbs in these specifications by using a BAU15s bayonet base. The BAU15s is an offset single-pin base with a different pin offset angle than the BA15s, making it incompatible with sockets designed for P21W or 1156NA bulbs.
The PY21W produces its amber color through the glass envelope itself, as is standard for ECE amber bulbs. It is rated at 12V and 21W as a single-filament bulb.
Across the specifications, the BAY15d base appears in three bulb types: the 2357NA, the P21/5W, and implicitly through the dual-filament ECE standard. The BA15s base appears in both the 1156NA and P21W, while the BAU15s base is exclusive to the PY21W in these specifications.