BMW X4 Fog Light Bulb Size

The BMW X4 fog light utilizes H7 and H8 bulb sizes for the front lighting assemblies. Data for the specified components covers the period from 2015 through 2021.

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
2021	H7	Check Price
2015-2018	H8	Check Price

Bulb Specifications

Description	Type	Shop
ECE standard (Europe & worldwide). Single-filament halogen bulb with PX26d base. Also approved in the US and Japan. 12V, 55W.	H7	Check Price
ECE standard (Europe & worldwide). Single-filament halogen bulb with PGJ19-1 base. Also approved in the US. 12V, 35W.	H8	Check Price

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Additional Notes

The BMW X4 fog light specifications reference two distinct bulb types across its model years: the H7 and the H8, both operating on a 12V system and both classified under the ECE standard, which governs lighting equipment across Europe and numerous other markets worldwide.
The H8 is a single-filament halogen bulb rated at 35W and fitted with a PGJ19-1 base. It is the specified fog light bulb for the BMW X4 across the 2015-2018 model years.
The H7 is a single-filament halogen bulb rated at 55W and fitted with a PX26d base. It is specified for the 2021 model year, drawing notably more wattage than the H8 used in earlier years.
The PGJ19-1 base of the H8 and the PX26d base of the H7 are physically incompatible with each other, meaning the two bulb types are not interchangeable despite both being single-filament halogen units operating at 12V.
The H7 carries approval for use in the United States and Japan in addition to ECE-regulated markets, while the H8 holds US approval alongside its ECE certification but is not listed as approved in Japan.
The wattage difference between the two bulb types is significant: the H7 operates at 55W compared to the H8's 35W, which reflects a difference in luminous output and electrical load on the vehicle's fog light circuit.