| Yes,
Swap bulbs across first to check
If still fails
Swap the ballasts
If the bulb is at fault, a set off bulbs off other websites vary £30 upwards.
I bought a pair off 6000k off Ebay for £30 for a pair, Normally it is a case of you pay for what you get but this pair seem to be fine and have been in 3 different cars of mine.
Si | 
