Mercedes-Benz E320 Map Light Bulb Size

The Mercedes-Benz E320 map light utilizes bulb sizes 12961 and H6W according to the provided specifications for the interior lighting components. Available data covers the range from 1998 through 2009 for the specified vehicle and lighting application.

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
2008-2009	12961
1998-2007	H6W

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W

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Additional Notes

The Mercedes-Benz E320 map light specifications cover model years 1998-2009 and reference two distinct bulb types: the H6W and the 12961.
The H6W is an ECE-standard single-filament signalling bulb rated at 12V and 6W, fitted with a BAX9s base, which is a small offset-pin bayonet base common in European automotive lighting applications.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, also rated at 12V but at 5W, and uses a W2.1x9.5d base, which is a standard wedge-type base held in place by friction rather than a locking pin or bayonet mechanism.
The H6W and 12961 use fundamentally different base types, the BAX9s and the W2.1x9.5d respectively, meaning the two bulbs are not interchangeable despite their similar voltage ratings.
The H6W was the specified map light bulb for the E320 across model years 1998-2007, representing the longer portion of the production span covered in these specifications.
The 12961 replaces the H6W as the specified bulb for the 2008-2009 model years, reflecting a change in the socket type used in the map light housing during that period.
The wattage difference between the two bulbs is small, with the H6W rated at 6W and the 12961 at 5W, though their incompatible bases make wattage comparison irrelevant for substitution purposes.