Like, the yellow here looks awful? Or is it a different shade?
http://www.autotrader.co.uk/car-details/202306278997930
It could be the same, the camera/settings used in that one has very very low contrast, or a very wide dynamic range which makes it look far more muted.. the other one has quite high contrast photos, and might be slightly over egging the 'pop' a bit..
Deffo go and see one in the flesh, cameras can really make certain colours look pants..