2018 Mercedes-Benz Sprinter Bulb Sizes

Quick Reference

The 2018 Mercedes-Benz Sprinter, a versatile workhorse, primarily utilizes halogen bulbs across its lighting system. However, specific trims and optional packages introduce differences, notably in the headlights.

For models equipped with the standard halogen headlights, both the low beam and high beam functions use an H7 bulb. Some higher trims or optional lighting packages may feature Xenon (HID) low beams, which utilize a D1S bulb. Even with HID low beams, the high beam typically remains an H7 halogen bulb.

Fog lights are commonly an H16 (Type 2), while the Daytime Running Lights (DRLs) use a W21/5W bulb. Front turn signals are WY21W (amber), and rear turn signals are PY21W (amber). Brake lights are P21W, and tail lights are P21/5W (dual filament for tail and brake function on some models). Reverse lights are typically W16W. License plate lights commonly use a C5W festoon bulb, and side marker lights are W5W.

Inside, dome and map lights can vary, but generally fall into C5W festoon or W5W wedge type bulbs depending on the specific fixture.

LED vs Halogen Upgrade Considerations

Upgrading your 2018 Mercedes-Benz Sprinter's halogen bulbs to LED can offer significant improvements in brightness, longevity, and a more modern aesthetic. However, it's not always a straightforward swap. The Sprinter, like many modern vehicles, uses a CANBUS (Controller Area Network Bus) system to monitor electrical components. Standard LED bulbs draw less power than their halogen counterparts, which can trigger "bulb out" warnings or flickering due to CANBUS error messages.

To avoid these issues, you'll typically need CANBUS-compatible LED bulbs or load resistors/decoders. These devices mimic the electrical load of a halogen bulb, tricking the CANBUS system into thinking everything is working correctly. When choosing LED upgrades, ensure they are specifically designed for CANBUS systems to prevent frustrating errors. Headlight LED upgrades may also require specific adapters or modification to fit within the housing and ensure proper beam pattern, especially in projector-style housings.

How to Replace Each Bulb

• Headlights (Low Beam/High Beam): Access is usually from the rear of the headlight assembly, often requiring the removal of a dust cap. Twist the bulb retainer or disengage the clip, unplug the electrical connector, and remove the old bulb. Install the new bulb, reconnect, and secure the retainer/cap.
• Fog Lights: Access might be from the front bumper, requiring removal of plastic trim or vents, or from underneath the vehicle. Unplug the connector, twist or unclip the bulb, and replace.
• DRL/Front Turn Signal: Often located within the headlight assembly or a separate housing beside it. Access is similar to headlights, usually by twisting a socket out of the housing.
• Rear Turn Signal/Brake Light/Tail Light/Reverse Light: These are typically accessed from the rear of the tail light assembly, inside the cargo area. You'll often need to remove a few screws or clips to detach the entire tail light housing, then twist the individual bulb sockets out.
• License Plate Lights: Usually accessed by prying off the clear lens cover from the outside or by unscrewing small fasteners. The bulb is then easily swapped.
• Side Marker Lights: These are often small, sealed units. You might need to gently pry them out to access the bulb or replace the entire assembly if it's a sealed LED unit.
• Dome/Map Lights: Carefully pry off the translucent lens cover using a plastic trim tool. The bulb will be accessible underneath.

Common Lighting Issues for This Generation

Owners of 2018 Mercedes-Benz Sprinters may encounter a few common lighting-related issues:

• Premature Halogen Bulb Failure: Due to the nature of halogen bulbs and vibrations inherent in commercial vehicles, these bulbs can have a shorter lifespan than expected. Keeping spare bulbs on hand is a good practice.
• CANBUS Error Messages with Aftermarket LEDs: As mentioned, installing non-CANBUS compatible LED bulbs without load resistors can lead to "bulb out" warnings on the dashboard, even if the bulbs are functioning. This is a common frustration for those upgrading their lighting.
• Corrosion in Tail Light Sockets: Exposure to moisture and road salt can sometimes lead to corrosion in the rear bulb sockets, causing intermittent or complete bulb failure. Cleaning the contacts or replacing the socket can resolve this.
• DRL Malfunctions: While less common, DRLs can sometimes fail or become intermittent, which could be due to a faulty bulb, wiring issue, or a problem with the DRL module itself.

Remember to consult your owner's manual for specific instructions and warnings related to bulb replacement, as procedures can vary slightly.

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