Mercedes-Benz G65 AMG front fog light bulb size is H11 and rear fog light bulb size is P21W. The replacement chart covers 2016 to 2018 production years with bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz G65 AMG uses the H11 bulb for its front fog lights across the 2016-2018 model years.
The H11 is a single-filament halogen bulb operating at 12V and 55W, built to the ECE standard recognized in Europe and worldwide, and also approved for use in the United States.
The H11 bulb uses a PGJ19-2 base, a proprietary locking connector that is not interchangeable with other common halogen bases such as H9 or H8, despite those bulbs sharing a physically similar housing.
The rear fog lights on the G65 AMG use the P21W bulb across the 2016-2018 model years.
The P21W is a single-filament signalling bulb rated at 12V and 21W, also built to the ECE standard.
The P21W uses a BA15s bayonet base, a single-contact bayonet fitting. It is not interchangeable with the BA15d base, which carries two contact points and is used in dual-filament applications.
Both the H11 and P21W operate on a standard 12V automotive electrical system, consistent with the vehicle's conventional low-voltage architecture.
The lower wattage of the P21W at 21W, compared to the H11 at 55W, reflects the differing functional roles of signalling bulbs versus forward-lighting halogen bulbs.