Xenon HID Headlight Ballast – Hella | BMW & Mercedes-Benz Applications | #63126937223

A failed xenon ballast leaves the headlight completely dark — no arc strike, no warm-up, just a dead lamp that reduces forward visibility and fails safety inspection. This is the Hella xenon HID ballast cross-referenced under BMW part number 63126937223, a direct replacement for BMW and Mercedes-Benz vehicles equipped with compatible xenon headlight systems.

What This Part Does

The HID ballast generates the high-voltage pulse needed to strike and sustain the xenon arc lamp. It provides the initial 20,000–30,000V ignition strike to ionize the xenon gas, then transitions to a regulated AC power supply that maintains stable arc operation and consistent light output. When internal components fail, the ballast cannot complete the arc strike or sustain the lamp — producing a dark headlight, flickering on startup, or an intermittent fault.

Common Symptoms of a Failing Ballast

• Headlight does not illuminate — no flicker or warm-up
• Headlight flickers and shuts off during warm-up phase
• Intermittent headlight operation
• Incorrect light color from unstable arc regulation
• Headlight fault code in the instrument cluster or control module

When to Replace

Replace when the ballast is confirmed failed after ruling out the bulb and wiring. Always replace the xenon bulb at the same time.

VIN Verification Required

Always verify your headlight configuration before ordering. Contact us and we'll confirm fitment before you buy.

Fitment

• BMW and Mercedes-Benz vehicles with compatible D1S/D2S xenon headlight systems
• Always verify by existing ballast part number and VIN before ordering

✔ HID xenon headlight configuration only
✔ Always replace xenon bulb when replacing the ballast

Part Numbers

• Cross-reference: 63126937223
• Manufacturer: Hella — 5DV 009.000-001
• SKU: 63126937223