Dean2

Have the same problem with my GS 430 except both headlights are going out. Dealer says it is the bulbs for sure, they only last 5 or 6 years so I did well with mine at 9. Just replaced the original battery too but this was happening before that. Dealer, $238 Canadian a bulb plus installation. Canadian Tire wanted $150 a bulb, Rock Auto was $65 U.S> but another $25 U.S. for shipping. Far and away the cheapest I could find was Amazon. They are $69 Canadian each, free shipping, for the factory Phillips D4S HID bulb, and they are guaranteed to be genuine Phillips or your money back. (Phillips has a site where you can verify the security code on the package).