Mercedes-Benz G65 AMG Back Up Light Bulb Size

The Mercedes-Benz G65 AMG back up light uses a P21W bulb size for replacement applications. The replacement chart covers 2016 to 2018 vehicle 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.

Bulb Size by Year Range

Years	Bulb Size
2016-2018	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The Mercedes-Benz G65 AMG uses the P21W bulb for its back up light across the 2016-2018 model years.
The P21W is an ECE-standardized bulb type, meaning it conforms to regulations recognized across Europe and numerous other markets worldwide.
As a single-filament bulb, the P21W is designed exclusively for on/off signalling functions rather than variable-intensity applications, which aligns with its role as a back up light.
The P21W operates at 12 volts and draws 21 watts, placing it in the standard range for automotive signalling bulbs.
The BA15s bayonet base is a single-contact fitting, and this single-contact configuration is a distinguishing factor when sourcing a replacement, as it is not interchangeable with the BA15d double-contact variant despite the similar base size.