The Mercedes-Benz C63 AMG front fog light utilizes H7 and H11 bulb sizes, while the rear fog light requires a P21W size bulb. The replacement chart covers 2008 through 2011 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 H7 and H11 bulbs are the two front fog light types specified for the Mercedes-Benz C63 AMG across the 2008-2011 model years, with each type appearing in alternating years.
H7 is a single-filament halogen bulb operating at 12V and 55W, fitted with a PX26d base, and carries ECE approval for use in Europe and worldwide, with additional approval in the US and Japan.
H11 is also a single-filament halogen bulb rated at 12V and 55W, but it uses a PGJ19-2 base rather than the PX26d found on the H7, making the two bulbs physically incompatible despite sharing identical voltage and wattage ratings.
Although the H7 and H11 share the same 12V/55W electrical specification, their different base types mean one cannot be substituted for the other in the front fog light housing.
The front fog light of the C63 AMG takes an H11 bulb for the 2008 and 2010 model years, while the 2009 and 2011 model years require an H7 bulb instead.
The P21W is a single-filament signalling bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and holds ECE approval for Europe and worldwide use.
At 21W, the P21W operates at considerably lower wattage than the H7 and H11 fog light bulbs, reflecting its role as a signalling bulb rather than an illumination source.
The rear fog light of the C63 AMG uses the P21W bulb uniformly across all four model years from 2008-2011, with no variation between years.
The BA15s bayonet base of the P21W is a single-contact fitting, which is a standard base type widely used in automotive signalling applications.
All three bulb types specified for the C63 AMG, H7, H11, and P21W, conform to ECE regulations, indicating suitability for markets where ECE standards govern vehicle lighting.