2020 Mercedes-Benz Metris Bulb Sizes & Replacement Guide

Quick reference

The 2020 Mercedes-Benz Metris predominantly uses halogen bulbs across its lighting system, maintaining a consistent and reliable setup for most trims. There are no factory-installed HID or projector headlights, nor are there OEM LED headlight options for this model year.

LED vs halogen upgrade considerations

Upgrading your 2020 Mercedes-Benz Metris from the factory halogen bulbs to LED replacements can offer several benefits, including brighter illumination, a whiter light output, and potentially a longer lifespan. However, there are important considerations to keep in mind:

• CANBUS Errors: Modern vehicles like the Metris utilize a CANBUS (Controller Area Network Bus) system to monitor electrical components, including lighting. When you replace a halogen bulb with an LED, the LED's lower power draw can be misinterpreted by the CANBUS system as a burnt-out bulb, triggering a "bulb out" warning on your dashboard. To avoid this, you will need LED bulbs with built-in CANBUS decoders or external load resistors wired into the circuit. Without these, you'll likely experience hyper-flashing for turn signals and persistent error messages.
• Adapters Needed: While some LED bulbs are designed for direct plug-and-play installation, others may require specific adapters to secure them properly in the Metris's housing. This is particularly true for headlight bulbs (H7), where the base of the LED bulb or its cooling fan might be larger than the original halogen, necessitating an adapter to ensure a snug fit and proper beam pattern.
• Beam Pattern and Glare: LED headlight bulbs can produce a different beam pattern than their halogen counterparts. In reflector housings designed for halogen bulbs, some LED upgrades might scatter light excessively, leading to glare for oncoming drivers and an inefficient throw of light on the road. Look for LED bulbs specifically designed to mimic the halogen filament's light source position for optimal beam characteristics.
• Heat Dissipation: LEDs generate heat, and effective heat dissipation is crucial for their longevity. Many high-quality LED bulbs feature active cooling (fans) or large heatsinks. Ensure there's adequate space behind the headlight assembly for these components and proper airflow.

How to replace each bulb

Replacing bulbs on your 2020 Mercedes-Benz Metris is generally straightforward, but some locations might require a bit more maneuvering.

• Low Beam & High Beam Headlight (H7): Access is typically from under the hood. Locate the back of the headlight assembly, twist off the dust cap, disconnect the electrical connector, unclip the retaining spring, and replace the bulb. Be careful not to touch the glass of the new halogen bulb with bare hands.
• Fog Light (H16): These are usually accessed from the front wheel well by removing a few clips or screws from the fender liner, or potentially from underneath the vehicle. Twist the bulb housing to remove it and then disconnect the electrical connector.
• DRL (W21W): Similar to headlights, these are often accessed from behind the headlight assembly. Identify the DRL bulb holder, twist it out, and pull the bulb straight out.
• Front Turn Signal (WY21W): Located within the headlight assembly, access is typically from the engine bay. Twist the bulb holder counter-clockwise and pull it out. The bulb can then be pulled straight from the socket.
• Rear Turn Signal (PY21W): Access these by opening the rear cargo doors and looking for access panels or screws near the tail lights. Remove the necessary covers or screws to access the tail light assembly from behind. Twist the bulb holder to remove it.
• Brake Light (P21/5W) & Tail Light (P21/5W): These share the same dual-filament bulb and are housed within the rear tail light assembly. Access is typically from inside the cargo area, as with the rear turn signals. Twist out the appropriate bulb holder.
• Reverse Light (W16W): Also found within the rear tail light assembly, accessed from the cargo area. Twist the holder and pull the bulb straight out.
• License Plate (C5W): These are visible from the exterior, usually located above the license plate. Use a small flat-head screwdriver to gently pry open the lens cover, and the festoon bulb can then be removed.
• Front & Rear Side Marker (W5W): These are often integrated into the headlight or tail light assemblies or in separate small housings on the side. Access will vary but usually involves twisting the bulb holder or carefully prying a lens.
• Dome Light (C10W) & Map Light (W5W): Gently pry the plastic lens covers with a plastic trim tool to avoid damage. The bulbs are usually pushed or clipped into place.

Common lighting issues for this generation

For the 2020 Mercedes-Benz Metris, common lighting issues are generally related to the lifespan of halogen bulbs rather than complex electrical failures. Given its robust electrical system, persistent issues are less frequent but can include:

• Premature Bulb Burnout: While less common, certain bulbs (especially headlights or brake lights that are used frequently) might burn out before their expected lifespan. This can sometimes be attributed to vibrations, voltage fluctuations, or simply a manufacturing defect.
• Corroded Sockets: Over time, moisture and dirt can lead to corrosion in bulb sockets, causing intermittent operation or complete failure. Cleaning the contacts with electrical contact cleaner can often resolve this.
• Flickering Lights (Aftermarket LEDs): If you've installed aftermarket LED bulbs without proper CANBUS decoders or load resistors, you might experience flickering, especially with turn signals (hyper-flashing) or interior lights.
• "Bulb Out" Warnings: As mentioned in the LED upgrade section, these warnings are common when switching to aftermarket LEDs without CANBUS compatibility. Less commonly, a genuine "bulb out" warning could indicate a loose connection or a failing wiring harness, although this is rare.
• DRL Malfunctions: While not common, DRLs might occasionally stop working due to a blown bulb or an issue with the DRL module. Halogen DRL bulbs are susceptible to burning out like any other filament bulb.

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