The Mercedes-Benz SL600 front fog light requires H11, 9006, or H1 bulb sizes, while the rear fog light uses a P21/4W bulb size. The replacement chart covers 1994 to 2009 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 SL600 front fog light specification covers three distinct bulb types across the 1994-2009 model years: H1, 9006, and H11.
The H1 bulb is an ECE-standard single-filament halogen type rated at 12V and 55W, fitted with a P14.5s base, and holds the longest continuous fitment period in the SL600 front fog light specification, covering the 1994-2002 model years.
The 9006 is an ANSI-standard single-filament halogen bulb rated at 12V and 55W with a P22d base, and it replaced the H1 in the SL600 front fog light position for the 2004-2006 model years.
The H11 is an ECE-standard single-filament halogen bulb rated at 12V and 55W with a PGJ19-2 base, and it is specified for the SL600 front fog light for the 2007-2009 model years.
Although the H1, 9006, and H11 share the same 12V, 55W electrical rating, their bases are physically different and are not interchangeable with one another.
The 9006 follows the ANSI standard used primarily in the US and Canada, while the H1 and H11 follow the ECE standard used across Europe and worldwide, though both H1 and H11 also carry US approval.
The rear fog light on the SL600 uses the P21/4W bulb for the 1995-2002 model years, a dual-filament signalling type with a BAZ15d bayonet base rated at 12V with filaments at 21W and 4W respectively.
The P21/4W is an ECE-standard bulb, and its dual-filament construction distinguishes it technically from all three single-filament types specified for the front fog light position.
The BAZ15d bayonet base of the P21/4W is an offset pin design, which prevents incorrect installation of single-filament bulbs in the rear fog light socket.
The front fog light position on the SL600 underwent two bulb type changes across the specification range, shifting from the P14.5s-based H1 to the P22d-based 9006 and then to the PGJ19-2-based H11, each requiring a different socket fitment.