BMW X1 Parking Light Bulb Size

The BMW X1 parking light uses bulb size 12961 and bulb size P21W according to the provided specifications for the lighting components. Data for the lighting equipment covers the range from 2012 to 2022.

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
2022	P21W
2021	12961
2012-2015	12961 (With Halogen Capsule Headlamps)

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

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Additional Notes

The BMW X1 parking light specifications reference two distinct bulb types: the P21W and the 12961, each with different base types, wattages, and application standards.
The P21W is an ECE-standard single-filament signalling bulb rated at 12V and 21W, fitted with a BA15s bayonet base. Its 21W output places it in a higher power category than typical parking light bulbs, which commonly operate at 5W.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. The T10 wedge format is among the most widely used bulb types in automotive interior and exterior lighting applications.
The BA15s bayonet base of the P21W and the W2.1x9.5d wedge base of the 12961 are physically incompatible. These two bulb types are not interchangeable.
The 2022 BMW X1 uses the P21W for its parking light, while the 2021 model uses the 12961. Despite being consecutive model years, the two require different bulb types with different bases and wattages.
The 12961 specification for the 2012-2015 BMW X1 is conditioned on the presence of Halogen Capsule Headlamps, indicating that headlamp type is a determining factor in parking light bulb fitment for those model years.