The Mercedes-Benz CL65 AMG front fog light utilizes H7, H11, and 9006 bulb sizes, while the rear fog light requires a P21/4W bulb size. The replacement chart covers 2005 through 2010 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 CL65 AMG front fog light specifications cover model years 2005-2006, 2008, 2009, and 2010, with the rear fog light specifications covering 2005-2006.
Three of the four bulb types present across these specifications operate at 12V and 55W: the H7, H11, and 9006. The P21/4W rear fog light bulb operates at 12V with a dual-wattage rating of 21W and 4W.
The H7 is a single-filament halogen bulb built to the ECE standard, which governs lighting equipment across Europe and much of the world. It uses a PX26d base and carries approval in the US and Japan as well. It is specified for the CL65 AMG front fog lights in 2008 and 2010.
The H11 is also a single-filament halogen bulb under the ECE standard, though it uses a PGJ19-2 base rather than the PX26d found on the H7. Despite their shared wattage and voltage ratings, the two bulbs are not interchangeable due to their differing base types. The H11 is specified for the 2009 front fog light.
The 9006 follows the ANSI standard used in the US and Canada rather than the ECE standard. It uses a P22d base and is specified for the CL65 AMG front fog lights in 2005-2006.
Because the front fog light specification changes across model years, with the 9006 in 2005-2006, the H7 in 2008, the H11 in 2009, and the H7 again in 2010, year-specific confirmation is necessary before selecting a replacement bulb.
The P21/4W is a dual-filament signalling bulb that uses a BAZ15d bayonet base. Its two filaments operate at different wattages, a characteristic that distinguishes it from the single-filament halogen bulbs used in the front fog light positions. It is specified for the rear fog light in 2005-2006.
The BAZ15d bayonet base of the P21/4W has an offset pin configuration, which is a deliberate design feature that prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The H7 and H11 share the same ECE regulatory framework and identical 12V/55W electrical ratings, yet their base types differ, making substitution between them physically impossible without modification to the socket.
The 9006 and H7 are both single-filament halogen bulbs rated at 12V and 55W, but they are governed by different standards and use different base types, the P22d and PX26d respectively, which means they are not interchangeable despite their matching electrical characteristics.