Mercedes-Benz G500 front fog lights use H11 and H3 bulb sizes, while rear fog lights require P21W bulbs of corresponding dimensions. The replacement chart covers 2002 through 2008 production years with 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 G500 front fog light specification calls for two distinct bulb types across the 2002-2008 model range: the H3 for 2002-2007 and the H11 for 2008.
The H3 is a single-filament halogen bulb operating at 12V and 55W, built to ECE standards with approval in the US and Japan. It uses a PK22s base.
The H11 is also a single-filament halogen bulb rated at 12V and 55W under ECE standards, with US approval as well. It uses a PGJ19-2 base, which differs from the PK22s base of the H3.
Because the H3 and H11 use different base types, the two bulbs are not interchangeable. A 2008 G500 front fog housing requires an H11, while 2002-2007 housings require an H3.
Both the H3 and H11 share identical wattage and voltage ratings at 55W and 12V, meaning the electrical load on the fog light circuit remains consistent across all model years covered in the specification.
The rear fog light specification for the Mercedes-Benz G500 uses the P21W across all listed years, 2002-2008, making it the only bulb type in this specification with no year-to-year variation.
The P21W is a single-filament signalling bulb rated at 12V and 21W, considerably lower in wattage than the halogen fog bulbs used at the front. It uses a BA15s bayonet base and conforms to ECE standards.
The BA15s bayonet base of the P21W is a widely standardized single-contact base, distinct from the wedge or pin-type bases found on the H3 and H11, and the three base types are mutually incompatible.