The Mercedes-Benz G55 AMG front fog light uses H11 and H3 bulb sizes, while the rear fog light requires a P21W bulb size. The replacement chart covers 2003 to 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 Mercedes-Benz G55 AMG uses two distinct front fog light bulb types across its model years, with H3 fitted to 2003-2007 models and H11 fitted to 2008-2011 models. These two bulb types are not interchangeable due to different base designs.
The H11 bulb uses a PGJ19-2 base, while the H3 uses a PK22s base. The physical incompatibility of these bases means a direct substitution between the two front fog light generations is not possible.
Both the H11 and H3 are single-filament halogen bulbs rated at 12V and 55W, placing them in the same power class despite their different base configurations.
The H3 bulb holds ECE approval for Europe and worldwide use, with additional approval in the United States and Japan, giving it one of the broader regulatory acceptance profiles among halogen fog light bulbs.
The H11 bulb carries ECE approval for Europe and worldwide use and is also approved in the United States, making it suitable for markets on both sides of the Atlantic.
The rear fog light position on the G55 AMG uses the P21W bulb across all model years from 2003 to 2011, representing the only position with no change in bulb type throughout the vehicle's production span covered by these specifications.
The P21W is a single-filament signalling bulb rated at 12V and 21W, operating at a significantly lower wattage than the front fog light bulbs, which reflects its role in rear visibility signalling rather than forward illumination.
The P21W uses a BA15s bayonet base, a base type that is mechanically distinct from the wedge and pin bases found in the front fog light bulbs, making cross-position substitution physically incompatible.
The P21W carries ECE approval for Europe and worldwide use, consistent with the regulatory standing of the other bulb types specified for this vehicle.