One the of the xenon headlights is pinkish in color and not as bright as the other. Cost to replace ?

 

Yup...they color shift just before they burn out ...
Do yourself a favor....buy a pair so the color matches...xenons dim a bit, and shift color as they age...pink is the final stage...might only start a couple more times...
$$ carries with brand and quality...
OEM is 4300k for color... generally hard to find, but many like the slightly whiter 5000k bulbs, that tend to be cheaper.
Many vendors sell them...imo buy them from a trusted company.. there are many are counterfeit bulbs that have a short life and low output... so buy wisely...I would stay away from most eBay sellers and non Amazon company sellers on Amazon if you go that route.
ECS , one of the vendors here has a few different brands....and BOTH versions...
Yes...you must buy the correct ones..2002-2004 have one version, 2005+ have another in gen1 cars, and even in gen2 there are variations.... bi-xenons vs adaptive...
So their put in you car model year and options feature is useful to be sure to get the right part.

 

Yea, they just need changed, do them in pairs so they match.

Gen 2 MINI :

https://www.northamericanmotoring.co...rade-swap.html