What size headlight bulb for 2010 Mercedes ML350?

The bulb sizes for a 2010 Mercedes ML350 depend on the headlight type your car uses. If your ML350 has halogen headlights, you’ll typically use H7 for the low beam and 9005 for the high beam (fog lights use H11). If your ML350 is equipped with factory HID Bi‑Xenon headlights, the ballast‑driven bulbs are typically D2S, with no separate high‑beam bulb in the unit. Verify your exact configuration with your owner’s manual or a parts diagram for your VIN.

To determine your exact setup, follow the steps below and then use the corresponding bulb sizes for replacement.

Identify your headlight type

Use the following indicators to determine whether your ML350 uses halogen or HID headlights and proceed to the appropriate bulb sizes.

Visual and equipment cues

Look for a headlight ballast in the engine bay, a label on the headlight housing, or documentation in the owner’s manual. Halogen headlights usually have a simple bulb behind a traditional housing, while HID Bi‑Xenon headlights use a ballast module and often have a more compact, projector‑style assembly.

Before proceeding with any lists, note that some markets offered different options. Always confirm with your vehicle’s VIN or official Mercedes parts diagrams if you’re unsure.

Halogen headlight bulb sizes (common on 2010 ML350 with halogen headlights)

If your ML350 uses halogen headlights, the following sizes commonly apply for the main headlamps. Use these as a starting point and verify with your vehicle’s documentation.

• Low beam: H7 (55W) bulbs


• High beam: 9005 (HB3) bulbs


• Front fog lights (if equipped): H11 bulbs

Halogen configurations are the most straightforward to replace, and many US‑market ML350s from this era used this setup on base or non‑HID trims. Always cross‑check the exact bulb type on the label inside the driver’s door jamb or in the owner’s manual before purchasing replacements.

Xenon / HID Bi‑Xenon headlight bulb sizes (factory HID headlights)

For ML350s equipped with factory HID Bi‑Xenon headlights, the ballast‑driven bulbs are typically D2S (with D1S appearing on some models or markets). The headlight assembly uses a single HID bulb and ballast; there isn’t a separate high‑beam bulb in the same unit.

• Bulb type: D2S (most common for 2010‑era MB HID headlights; some markets may use D1S)


• Note: Some regions or production dates may show variations; verify by reading the ballast label or consulting the Mercedes parts diagram for your VIN

Because Xenon headlights rely on ballast electronics, it’s important to replace bulbs in pairs when replacement is needed and to ensure the ballast is functioning correctly. If you’re unsure of the exact bulb type, check the headlight assembly label or contact a Mercedes dealer with your VIN.

Replacement tips and best practices

Before buying or replacing bulbs, consider these practical notes to ensure a safe and accurate swap.

• Wear clean gloves or use a cloth when handling bulbs to avoid oil contact, which can shorten bulb life.


• Disconnect the battery and wait a few minutes before accessing the headlight assemblies to avoid electrical shocks or ballast issues.


• If you’re replacing HID bulbs (D2S/D1S), consider replacing both sides at the same time to maintain consistent color and intensity.


• After replacement, test the lights and have the headlight aim checked and adjusted if needed to maintain proper road illumination.

For any doubt about compatibility or installation, consulting a professional or your local Mercedes service center can help prevent mistakes and ensure correct alignment and performance.

Where to buy bulbs

Reliable sources include official Mercedes parts stores, authorized dealers, and well‑reviewed automotive retailers. When possible, match the exact bulb type to your VIN to avoid compatibility issues.

In all cases, starting with the owner’s manual or a current parts diagram for your exact VIN will prevent mis-purchases, especially given regional variations in equipment for the 2010 ML350.

Summary

Key takeaways for the 2010 Mercedes ML350 bulb sizes: halogen headlights typically use H7 for low beams and 9005 for high beams (H11 for fogs); factory HID Bi‑Xenon headlights use D2S bulbs with a ballast (no separate high‑beam bulb). Identify your headlight type by checking the ballast, housing labeling, or manual, and replace bulbs accordingly. Always handle bulbs carefully, maintain proper alignment, and verify compatibility with your VIN before purchasing.

Do I need H11 or 9005?

H11 bulbs are designed for use as low beam headlights, while 9005 bulbs are typically used for high beams. This results in a higher brightness level for the 9005 bulbs compared to the H11 bulbs.

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