Mercedes-Benz Sprinter Stepwell Bulb Size

The Mercedes-Benz Sprinter stepwell bulb uses size 12961. The replacement chart contains vehicle production years and bulb size specifications spanning 2010 to 2018.

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 Type	Shop
2010-2018	12961 (Rear)	Check Price

Bulb Specifications

Description	Type	Shop
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price

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Additional Notes

The Mercedes-Benz Sprinter uses the 12961 bulb for its rear stepwell position across the 2010-2018 model years.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base.
The T10 designation refers to a tubular bulb body approximately 10mm wide, a common size in automotive interior and courtesy lighting applications.
The W2.1x9.5d base is a wedge-type base, meaning the bulb is held in its socket by the tension of the base itself rather than by a bayonet or screw mechanism.
The 12961 operates at 12 volts and 5 watts, which is consistent with low-power interior courtesy and step lighting circuits.
The stepwell position is listed specifically as rear, indicating the specification applies to the rearmost entry point of the Sprinter rather than any forward cabin positions.
Because the W2.1x9.5d base is a standardized wedge fitting, T10 bulbs from other manufacturers sharing the same base and electrical ratings are generally considered interchangeable with the 12961 in this application.
The consistent use of a single bulb type across all nine model years covered suggests no mid-cycle changes were made to the stepwell lighting specification during this period.