Mercedes-Benz GLK250 Turn Signal Bulb Size

The Mercedes-Benz GLK250 front turn signal bulb uses a 12174NA size. The replacement chart covers 2013 to 2015 production years with corresponding bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
2013-2015	12174NA

Bulb Specifications

Description	Bulb Size
OEM part number. Natural amber glass variant. 12V.	12174NA

Other Locations

Additional Notes

The 12174NA is the specified front turn signal bulb for the Mercedes-Benz GLK250 across the 2013-2015 model years.
The 12174NA carries an OEM part number designation, meaning it is a factory-specified component rather than an aftermarket equivalent reference.
The "NA" suffix in the 12174NA part number denotes a natural amber glass construction, where the amber color is built into the glass envelope itself rather than achieved through a coating or lens tint.
The 12174NA operates on a 12-volt electrical system, which is standard for passenger vehicle automotive applications.
The same bulb size applies uniformly to all three model years of the GLK250 covered in these specifications, indicating no mid-cycle change to the front turn signal fitment during that period.