Mercedes-Benz GLC350e front turn signal uses 12174NA bulb size while rear turn signal requires 12496 bulb size. The replacement bulb size chart covers 2018 to 2020 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz GLC350e front turn signal uses the 12174NA bulb across the 2018-2020 model years, with fitment restricted to vehicles equipped with halogen capsule headlamps.
The 12174NA is an OEM part number designation, meaning it originates from the original equipment manufacturer rather than an aftermarket numbering system.
The natural amber glass construction of the 12174NA produces its amber turn signal color through the glass itself rather than through a colored lens or coating.
The 12174NA operates at 12V, which is standard for automotive electrical systems in passenger vehicles.
The rear turn signal of the GLC350e uses the 12496 bulb across the 2018-2020 model years.
The 12496 carries a Philips/Osram part number designation, placing it within the cataloging systems of those two major automotive lighting manufacturers.
The 12496 is classified as a specialty application halogen bulb, indicating it is intended for a specific fitment rather than general-purpose use.
Both the 12174NA and 12496 share a 12V operating voltage, though they serve different positions on the vehicle and are not interchangeable with each other.
The front turn signal fitment note referencing halogen capsule headlamps indicates that vehicles with a different headlamp configuration may not share the same front turn signal bulb requirement.