Specific wiring harness for retrofitting Bi-Xenon headlights with automatic headlight leveling for VW Golf 4 and Bora models manufactured before 08/2002. This wiring harness connects the headlights to the front and rear level sensors and the central electrical connection. Package contents: wiring harness. Note: After installation, the sensors must be recoded using diagnostic equipment. In addition to the xenon headlights, you will also need headlight washers. This option is often included in the factory winter package. In most countries, the retrofit system is legally required when used with xenon headlights.