2017 Mercedes-Benz Sprinter — Bulb Sizes (Headlight, Tail, Fog)

As an ASE-certified master technician, I have seen plenty of Mercedes-Benz Sprinter vans roll into the shop. The 2017 Sprinter (part of the W906 generation) is an absolute workhorse, trusted by fleet operators, delivery drivers, and camper-van converters alike. However, keeping it on the road safely means keeping its lighting system fully functional. Whether your 2017 Sprinter is equipped with standard halogen housings or the upgraded Bi-Xenon (HID) package, finding the correct bulb sizes is critical for maintenance or upgrading.

Here is the definitive guide to the bulb sizes for the 2017 Mercedes-Benz Sprinter.

Quick reference

Use this quick reference chart to identify the exact bulb size you need. Please note that the exact bulb may vary depending on whether your Sprinter is equipped with standard halogen reflector headlights or the premium Bi-Xenon projector headlights.

Note: Sprinter vans with the Bi-Xenon package use a D3S HID bulb for both low and high beams, but often still use an H7 bulb as an auxiliary high beam or flash-to-pass light.

LED vs halogen upgrade considerations

Upgrading to LED bulbs is incredibly popular for Sprinter vans, especially for overlanders and late-night delivery drivers needing better visibility. However, Mercedes-Benz vehicles are notoriously strict when it comes to their electrical systems.

The 2017 Sprinter uses a complex CANBUS (Controller Area Network) system that constantly monitors electrical resistance to detect burnt-out bulbs. If you install an aftermarket LED bulb—which draws significantly less power than a standard halogen—the SAM (Signal Acquisition and Actuation Module) will think the bulb is dead. This triggers an annoying "bulb out" error on your dashboard and may even cut power to that circuit.

To successfully upgrade to LEDs on a 2017 Sprinter:

• Always buy CANBUS-ready LEDs: These have built-in resistors to trick the computer.
• Turn Signal Resistors: If you upgrade the turn signals to LED, you will likely need to wire in external load resistors to prevent hyper-flashing.
• Headlight Adapters: Some aftermarket H7 LEDs require special retainer clips/adapters to lock into the Sprinter's headlight housing correctly.

How to replace each bulb

• Headlights (Low/High/DRL/Turn): Accessing the headlight bulbs requires reaching behind the headlight assembly under the hood. It’s a tight squeeze. You twist the dust cap off counterclockwise. For H7 bulbs, take care not to touch the glass with bare fingers, as the oils will cause premature failure.
• Fog Lights: These are accessed from underneath the front bumper. You may need to remove a plastic splash shield or access panel to reach the rear of the fog light housing.
• Rear Taillights (Brake/Turn/Reverse/Tail): Open the rear cargo doors. You'll find the retaining screws on the inside lip of the door jamb. Remove these, and the entire taillight assembly pulls away from the body. The bulbs are mounted on a single circuit board tray that clips into the housing.
• License Plate & Side Markers: Use a plastic trim tool to gently pry the housings out of their cutouts. The bulbs simply pull straight out of their sockets.
• Dome/Map Lights: Carefully pry the plastic lens covers off the overhead console using a small flathead screwdriver or trim tool to expose the festoon or wedge bulbs.

Common lighting issues for this generation

The W906 generation of the Sprinter has a few known quirks when it comes to lighting:

• Tail Light Circuit Board Melting: A very common issue on these vans is a poor ground connection in the rear taillight assembly. This causes excess heat, which can melt the plastic bulb carrier board or the wiring harness connector, leading to intermittent failures. Check the connector pins for signs of charring.
• SAM Module Faults: If multiple lights fail on one side of the van, or if new bulbs refuse to turn on, the SAM module might have suspended the circuit due to a perceived short. Sometimes, this requires a factory scanner to reset the module.
• Vibration Failures: Because the Sprinter is a commercial vehicle with stiff suspension, standard filament bulbs tend to burn out faster due to heavy vibrations. Upgrading to heavy-duty (Long Life) bulbs or quality LEDs can help mitigate this.

If you are dealing with a persistent electrical short or a melted wiring harness, it might be time to call in the professionals. Find a trusted shop on Repairius.