Opel D1S HID Headlight Ballast 5DV009720-00 New Ballast Module

Audi A4, A6 and other models D1S HID ballast, OEM 009720 by KLP; housing uses high-temperature engineering plastic with silicone sealant; against engine bay vibration and thermal shocks. Replaces OEM 5DV009720-00; raises 12V to the HID ignition voltage and stabilizes arc discharge for uniform headlamp brightness. Replacement difficulty medium; watch high-voltage insulation; professional technician recommended.