Mercedes-Benz C250 front and rear side marker bulbs use 12961 size specifications. The replacement chart covers 2012 to 2014 production years with bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz C250 uses the 12961 bulb across both front and rear side marker positions for 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 width of 10 millimeters, a common format in low-wattage automotive marker and interior lighting applications.
The W2.1x9.5d base type is a wedge-style connector, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
At 5 watts, the 12961 falls within the low-power range typical of side marker bulbs, which are designed for continuous visibility rather than high-intensity illumination.
The front and rear side marker positions on the C250 share the same bulb specification, indicating full interchangeability between those two locations.
When substituting the 12961 with a non-Philips equivalent, the W2.1x9.5d base and 12V/5W electrical rating must match to ensure proper fitment and circuit compatibility.