if you have h.i.d. headlights your not going to just be able to buy 2 of the cheaper bulbs, I'm sure the parts listing is either a d2s bulb(expensive one) or an h7(cheap one). they are not interchangable. Easiest way to tell without even pulling the bulb out is to pop and hood...look at the headlight housing and look for the high voltage stickers, these stickers indicate high voltage hid ballasts. If you don't have them, they are cheaper bulbs...H7 or if you have them you will need a new d2s bulb, or ballast depending on what really the problem is. If it's hid bulbs or parts you need I'd suggest ebay, either way you can still get a new phillips hid bulb for 30-40$ish if thats what you have

 

I'm going to run outside and take some pictures so you can better diagnose it... do you want a frontal pic and also a pic pointing down towards the headlights with the hood open?

 

Take a pic with headlights on (with the one that works :P) if both are off, than take a pic with the high beam headlight on. Don't be in front of the car but rather at 45 degree angle for a clean pic. Also if you can take it inside of a garage with minimal light or at night.

 

Take a pic of the inside, the back of the headlight housing is all we need to see.

 

They're coming in a second... just have to upload.

 

ZOMG the anticipation is killing me

 

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It's the round one that's out on the passenger side.

 

yeah regular H7's. if theres a dealer close areound you just go and get it replaced. sould be like 20$. they do it in the service drive. takes 2 min.

if not, just go buy the bulbs and do it yourself.

 

h7 halogen bulb i would say. 15-20$ in any autoparts store. Same thing as mine and changed one of them last weekend. But post some pics of the inside (back of headlight housing) to see if other members agree :P