Here is a great mod for anyone wanting to change their fog lights and city lights to match the color of their Xenon headlamps. The color is close to a perfect match and throw NO ERROR CODES. The stock bulbs were too yellow for my taste.

City/Running Lights = PIAA 19172 168 Xtreme White Wedge bulbs:

Fog Lights = HOEN 35w Xenonmatch
http://www.hoen-usa.com/fog.htm

Here is a pic that shows a comparison from my car. The passenger side has the new bulbs - GREAT COLOR!!!