Mercedes-Benz C250 Map Light Bulb Size

The Mercedes-Benz C250 map light requires a bulb size of 12961 for the interior lighting system. Data for the specified component covers the range from 2012 to 2014.

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
2012-2014	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The Mercedes-Benz C250 uses the 12961 bulb for the map light across the 2012-2014 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, operating at 12 volts and 5 watts.
The T10 designation refers to a tubular bulb with a nominal width of 10 millimeters, a common size in low-current automotive interior lighting applications.
The 12961 uses a W2.1x9.5d base, which is the standard wedge-type base for T10 bulbs, where the electrical contact is made through the wedge-shaped glass pinch rather than a separate metal connector.
At 5 watts, the 12961 is rated for low-power interior use, consistent with map and courtesy lighting functions where prolonged illumination without significant battery draw is a practical consideration.
The W2.1x9.5d base specification is relevant to fitment, as substituting a bulb with a physically different base type would be incompatible with the C250 map light socket regardless of voltage or wattage similarity.