Headlight W166 Xenon for Mercedes-Benz GL-Class

OEM-spec Bi-Xenon projector headlamp assembly for the first-gen Mercedes-Benz GL-Class (X166, pre-facelift 2013–2015). Built to factory geometry for correct beam pattern, mounting and panel gap. Ideal replacement for crash damage, yellowed lenses or failed internals. Sold per side — choose Left or Right.

What this is:

• Included: 1× complete xenon-type headlamp

Key Features:

• OE Fit & Optics: Matches X166 GL pre-facelift lamp tooling for clean fit and factory beam cutoff.

• UV-Coated Lens: Clear polycarbonate with hardcoat to resist haze/yellowing.

• Module-Ready: Accepts your original ballast/igniter/AFS hardware (no re-engineering).

• Road-Legal Pattern: Designed for the correct RHD/LHD market variant (order accordingly).

Compatibility:

• GL-Class (X166) — 2013–2015 pre-facelift Bi-Xenon/ILS vehicles.

• Not for GLS (X166 facelift, 2016–2019) or ML/GLE (W166), and not for full-LED headlamps.
  Always confirm by VIN and visually match your original lamp (shape, brackets, connector).

Typical OE Family (for cross-reference only):
A166/ A166-9xx-… / A166-906-… (LH) and A166-907-… (RH) families vary by supplier/market; order by the exact number on your old lamp.

What’s Included / Not Included:

• Included: Headlamp assembly (xenon type), side-specific.

• Not included: Bulb, ballast/igniter/ECU, AFS motor, rear caps, seals, wiring.

Installation Notes (Pro Tips):

• Disconnect battery; transfer all original electronics (ballast/igniter/AFS/DRL driver) to this housing.

• Inspect and reseal vents/caps to prevent condensation; replace gaskets if perished.

• After install, set headlight aim; if equipped with AFS/auto-levelling, perform calibration using Mercedes-capable diagnostics (e.g., Xentry).

• If your old lamp had water ingress, dry the connectors and check harness pins for corrosion before re-use.

Q&A
Q1: Can I use this to convert halogen to xenon?
A1: No. Xenon systems require different wiring, sensors and control units. Use only as like-for-like replacement.

Q2: Does it come with ballast and bulb?
A2: No — reuse your originals or purchase replacements separately (match bulb type D1S/D3S as per your vehicle).

Q3: Will it fit the GLS (2016–2019)?
A3: No. The GLS facelift uses different lamp tooling and electronics.

Q4: Left or Right?
A4: Lamps are side-specific. On right-hand-drive vehicles, Left = driver, Right = passenger. Verify by VIN and bracket layout before ordering.