The Mercedes-Benz CL55 AMG front turn signal uses 2357NA or 1156NA bulb sizes, while the rear turn signal requires 1156NA or PY21W bulb sizes. The replacement chart covers 2001 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 1156NA is the most frequently specified bulb across both front and rear turn signal positions on the Mercedes-Benz CL55 AMG, appearing in ten of the twelve total position-year entries in these specifications.
The 1156NA is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base and natural amber glass.
The 2357NA is a dual-filament bulb rated at 12V with a high filament draw of 26.9W and a low filament draw of 8W, using a BAY15d bayonet base with natural amber glass.
The BAY15d base of the 2357NA and the BA15s base of the 1156NA are physically distinct, making these two bulbs non-interchangeable despite their similar appearance.
The front turn signal position on the Mercedes-Benz CL55 AMG uses the 1156NA for model years 2001-2004 and transitions to the 2357NA for 2005-2006, reflecting a change in filament configuration at that position.
The PY21W follows the ECE standard used in European and worldwide markets, whereas the 1156NA and 2357NA follow the ANSI standard used in the United States and Canada.
The PY21W uses a BAU15s bayonet base, which has an offset pin arrangement that differs from both the BA15s and BAY15d bases, preventing cross-substitution with the other bulbs listed in these specifications.
The PY21W and 1156NA share the same voltage and wattage rating of 12V and 21W, yet their differing base types and regulatory standards mean they are not interchangeable fitments.
The rear turn signal position specifies the PY21W for model years 2003-2004, while the surrounding years in that position call for the 1156NA, indicating a base-type change at that specific position across the model range.
All three bulb types listed in these specifications operate at 12V, consistent with the standard electrical system voltage found in passenger vehicles of this class.