This is very strange you guys. I have a b5 s4 with about 93k on it and now the driver HID the light just turn pink and the passenger still working fine. Can you please feel me in on what is going on because I don't have a clue. thanks you guys.

 

Either the bulb is going out, or it's the ballast. You can try & swapping the bulbs or ballast, and seeing what one is going.