Bi-xenon replacement Help
One easy way to test the bulb is to swap the bulbs from each side, right to left and left to right. See if the symptom follows the bulb or not.
Be careful not to touch the glass of the bulb. If you do wipe it down with rubbing alcohol then, re-install.
As for buying bulbs I would not buy one at the dealer, I would buy a pair from an alternate source. (Get a quote, you'll see what I mean) I'd stick with name brand as opposed to aftermarket.
I recently bought Phillips 85122+ from the retrofit source for $95 for the pair.
All HID bulbs change in color and brightness over time, for that reason replacing in pairs makes sense if you want a match. Also service life will catch up with you on the other bulb if you don't replace.
Factory ballasts can go for $500, not sure about a w211 though. Aftermarket ballasts are $50 or less but will require knowledge of circuitry, some modification, soldering etc.
Good Luck!
Last edited by Tschuss_Bill; Nov 14, 2012 at 10:24 AM.
On my previous car (W210) my bulbs lasted me 220,000 miles. It did fail to light up once or twice but was never an issue.
is it easy to replace the bulb? i've been searching and there were no diy instructions on how to change it? Thanks
is it easy to replace the bulb? i've been searching and there were no diy instructions on how to change it? Thanks



