Mercedes-Benz G63 AMG front fog light bulb size is H11 and rear fog light bulb size is P21W. The replacement chart covers 2013 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 G63 AMG uses the H11 bulb for its front fog lights across the 2013-2018 model years.
The H11 is a single-filament halogen bulb operating at 12V and 55W, built to the ECE standard used in Europe and worldwide, with approval also granted 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 G63 AMG use the P21W bulb across the same 2013-2018 model years.
The P21W is a single-filament signalling bulb rated at 12V and 21W, also produced under the ECE standard.
The P21W uses a BA15s bayonet base, which is a single-contact bayonet fitting. This distinguishes it from the visually similar P21/5W, which uses a BA15d dual-contact base and carries a second filament for combined stop and tail functions.
Substituting a dual-contact P21/5W in place of the single-contact P21W is not electrically compatible, as the BA15d and BA15s bases differ in pin configuration.
The front and rear fog lights on the G63 AMG operate on separate bulb families, with the front position using a halogen technology bulb and the rear position using a traditional incandescent signalling bulb.