Usually CV joint only click when the wheels are turned. If you have this noise going in a straight line, it's probably something else. If your Yaris is still under warranty, Toyota must look at it for you. I would be very upset too if I had to take my "new" car in after such a short time. Don't be afraid and demand your right to a repair if needed - dealers are notorious for giving customers a difficult time when needing warranty work. If it is a part that is not covered, you don't have to get it repaired at the Toyota dealer. Even if it is the CV joint, it is not really that hard to replace the half shafts and the cost for parts alone is pretty cheap.
__________________
|