HID Xenon Headlight Ballast - Control Unit Module - Replaces 307 329 115, 8e0 907 391b, 1307 329 098 - Compatible with Audi, Cadillac & More - A4, S4, RS4, A3, DTS, MKX, 9-7x, C300

HID Xenon Headlight Ballast - Control Unit Module - Replaces 307 329 115, 8e0 907 391b, 1307 329 098 - Compatible with Audi, Cadillac & More - A4, S4, RS4, A3, DTS, MKX, 9-7x, C300 Replacement HID OR Xenon Ballast - is responsible for supplying power to your headlight's bulb. Overtime your HID Ballast can fail resulting in a headlight that flickers or does not turn on at all. Every ballast is designed to connect directly to your vehicle and requires NO programming or coding. Compatible Replacement for Audi, Cadillac DTS, Lincoln, Saab, Saturn & Volvo S40 Vehicles - 2008 - 2009 A4, S4 Cabrio | 2005 - 2008 S4, A4, RS4 Saloon & Wagon | 2006 - 2008 DTS | 2008 MKX | & more. See below for the full vehicle list. This WILL NOT FIT models that have AFS or Curved Lighting. Replaces Part#307 329 115, 8e0 907 391 b, 1 307 329 098 - Each of your vehicle’s headlights has its own ballast. These ballasts are commonly mounted either on the back or on the bottom of the headlights. W